1970 Washington Quarter Errors: Value Guide & Rare Varieties
Is your 1970 Washington Quarter worth money? Identify the DDO FS-101 ($1,750–$2,500), Dime Stock thin quarter ($200–$600), and legendary Proof overstrikes worth $35,000–$75,000. Complete identification guide with diagnostics.
Most 1970 Washington Quarters are worth face value, but the right errors command real money — the Denver Doubled Die Obverse FS-101 reaches $1,750–$2,500, the Dime Stock thin quarter fetches $200–$600, and legendary San Francisco Proof overstrikes on silver host coins are valued at $35,000–$75,000.
- ★ Top jackpot: 1970-S Proof struck over 1900 Barber Quarter — ~$75,000 (only 2 known)
- ★ Most accessible error: 1970-D Dime Stock thin quarter — weigh your coin; ~4.2g = $200–$600
- ★ Die variety king: 1970-D DDO FS-101 — strong split doubling on LIBERTY — $1,750–$2,500 at MS65
- ★ Condition rarity: 1970-D MS69 sold for $15,000 on eBay in 2023
⚠️ Warning: 99% of apparent "doubled" 1970-D quarters are flat, shelf-like Machine Doubling — worth face value only. A 10x loupe and digital scale (0.01g) are essential before claiming any find.
1970 Washington Quarter Errors Error Checker
Check your coin for valuable errors and varieties
Values shown are typical retail estimates as of 2026-01 and may vary based on market conditions.
Error coin values depend heavily on grade, eye appeal, and professional authentication status.
Professional authentication by PCGS or NGC is strongly recommended for any coin suspected to be a valuable variety or error.
Machine Doubling (flat, shelf-like doubling) is NOT a Doubled Die and has no numismatic premium. This is the single most common misidentification for 1970-D quarters.
The 1970-S Proof overstrikes on Canadian and Barber quarters are unique or nearly unique specimens. Finding one is extremely unlikely but theoretically possible.
Die deterioration and flow lines on 1970-D quarters are normal results of high-volume production on hard clad planchets and do not add value.
Condition rarity is significant for 1970 quarters — MS67+ examples of any mint can be worth $2,000+ due to Registry Set competition.
The 1970 Washington Quarter looks ordinary — and most of them are. But hidden within the millions minted in Denver and San Francisco are some of the most extraordinary errors in U.S. Mint history: Proof coins accidentally struck over 70-year-old silver quarters, business strikes punched from the wrong metal strip, and doubled dies worth thousands in pristine condition. Whether you found a quarter in a coin jar or a dealer's junk box, this guide gives you every diagnostic you need. For standard pricing by condition, start with the 1970 Quarter Value overview — then come back here to hunt for errors.
1970 Washington Quarter Specifications & Mintage
Before hunting for errors, know what a normal 1970 Washington Quarter looks and feels like. The coin is a clad "sandwich" — outer layers of 75% copper / 25% nickel bonded over a pure copper core. This structure gives it a silvery face with a telltale reddish-brown edge stripe.
| Attribute | Value |
|---|---|
| Composition | Clad: 75% Cu / 25% Ni outer layers; pure Cu core |
| Weight | 5.67 grams (tolerance ±0.227g) |
| Diameter | 24.3 mm (0.955 in) |
| Thickness | 1.75 mm |
| Edge | Reeded (ridged) |
| Melt Value | None (no silver content) |
| Mint | Mint Mark Location | Mintage | Strike Type |
|---|---|---|---|
| Philadelphia | None (no mark) | 136,420,000 | Circulation; notoriously poor strike quality |
| Denver | "D" right of ponytail | 417,341,364 | Circulation; home to most varieties & errors |
| San Francisco | "S" right of ponytail | 2,632,810 | Proof only; sold in annual Proof Sets |
💡 Required Tools
You need a 10x loupe (hand magnifier) to identify die varieties and distinguish genuine doubling from machine damage. You also need a digital scale with 0.01g precision to catch the Dime Stock error. Both cost under $20 combined online.
For complete pricing by grade and condition, see our 1970 Quarter Value guide.
1970 Washington Quarter Quick Checks: What to Look For
Work through these checks on your coin. Denver Mint coins (marked "D") have the most to offer — run every check on them. Philadelphia coins are generally common, and San Francisco coins were Proof-only. If you spot a potential match, jump to the detailed guide for that variety.
Check 1: Doubled Die Obverse FS-101 — Denver Only
Obverse (front): the word LIBERTY, the motto IN GOD WE TRUST, and the date 1970. Use your 10x loupe.
Strong, rounded doubling on LIBERTY — especially on the B and E — with wide separation between the two images. Thickening and splitting on IN GOD WE TRUST. A visible secondary offset image on the date. Look for split serifs (the tiny feet on letters) that are raised, not flat.
Machine Doubling — which looks flat and shelf-like with sheared metal rather than a raised second image. 99% of 1970-D "doubled dies" are actually Machine Doubling with zero premium. If the doubling looks smeared or one-dimensional, it is NOT FS-101.
Check 2: Dime Stock Thin Quarter — Denver Only
Weigh the entire coin on a digital scale. Also scan the edge and rim — peripheral lettering (LIBERTY, QUARTER DOLLAR) may fade into the rim on a genuine example.
Weight of approximately 4.2–4.3 grams (standard is 5.67g). The coin is uniformly thin across the entire surface. Even uncirculated examples show weak high-point detail on the eagle's feathers and Washington's hair due to insufficient metal.
A worn circulated coin at normal weight, or a coin that was filed or ground down after minting (those show uneven thickness and tool marks). Environmental damage never reduces weight. Only the scale tells the truth.
Check 3: Doubled Die Reverse FS-801 — Denver Only
Reverse (back): the lettering UNITED STATES OF AMERICA, the eagle's wings, lower leaf branches, and stems. Use 10x loupe.
A clockwise rotational spread on the UNITED STATES lettering — the U in UNITED shows clear split serifs. Doubling also visible on lower branches, leaves, inside wing feathers, and stems. Medium spread on QUARTER DOLLAR. CONECA designation: 1-R-II-E.
Machine Doubling (flat and shelf-like). Also not FS-802 — which has a northeast spread rather than a clockwise rotational spread. The direction matters for correct attribution and value.
Check 4: Doubled Die Reverse FS-802 — Denver Only
Reverse: the motto E PLURIBUS UNUM and the lettering UNITED STATES OF AMERICA. Use 10x loupe.
A northeast spread direction on E PLURIBUS UNUM — doubling is most visible on the left side of the motto. Light to moderate doubling on UNITED STATES with distinct split serifs.
Machine Doubling. Also not FS-801 — the spread direction is northeast here, not clockwise rotational. Both varieties are valuable but require correct attribution for accurate pricing.
Check 5: Doubled Die Obverse FS-102 — Denver Only
Obverse: all lettering (LIBERTY, IN GOD WE TRUST) and the 1970 date.
Doubling visible on all obverse lettering and the date. Rarer than FS-101 and potentially more valuable in Gem condition (up to $3,000 at MS65). Has different spread characteristics than FS-101 — compare carefully.
Machine Doubling. Verify it is not FS-101 by comparing spread pattern and intensity. Both are extremely valuable — correct attribution is essential for pricing.
Check 6: Off-Center Strike — All Mints
Look at the overall shape of the coin. Is there a crescent-shaped blank area where the design is completely missing?
A smooth, unstruck crescent of blank metal. The more severe the offset (higher percentage), the more valuable. Retaining a visible date is critical — dateless off-centers are worth much less. A 70% off-center 1970-D sold for $1,020.
A coin cut, filed, or damaged post-mint. Genuine off-center strikes have a smooth, natural planchet surface in the blank area with no tool marks or jagged edges.
Check 7: Wrong Planchet Error — Denver Only
Check the coin's overall size, weight on a scale, and color. A wrong-planchet coin will be clearly abnormal in at least one of these properties.
Struck on nickel planchet: weighs ~5.0g with a slightly different edge. Struck on cent planchet: appears copper-colored, significantly undersized, much of the quarter design is missing because the smaller planchet couldn't fill the dies.
Environmentally damaged or chemically treated coins. A plated or painted coin changes color but does not change weight or diameter. Always weigh — environmental damage cannot reduce a coin's mass.
Check 8: Clipped Planchet — All Mints
Examine the entire edge of the coin. Look for a curved, straight, or ragged missing section.
A curved clip (most common) creates a crescent-shaped missing area. Straight clips appear at the end of the metal strip. Look for the Blakesley Effect — a weak or missing rim area directly opposite the clip — which confirms it happened before striking.
A coin cut with pliers or wire cutters after minting. Genuine clips have smooth, natural edges at the boundary and show the Blakesley Effect. Tool-cut coins have jagged edges and no Blakesley Effect.
TRAP: Machine Doubling — Looks Like DDO But Is Worthless
Date, LIBERTY, IN GOD WE TRUST, and all reverse lettering — especially common on 1970-D quarters due to overworked presses and hard clad planchets.
Machine Doubling creates a flat, shelf-like secondary image where metal is sheared sideways. A genuine Doubled Die creates a rounded, raised secondary image with split serifs. Look at the letters under magnification: flat and smeared = MD (worthless); raised and rounded = possibly a real DDO.
1970 Washington Quarter Error & Variety Value Chart
Standard values by mint and condition are shown below, followed by the master error table. Use the mint-specific rows to find your coin's starting baseline, then check the error table for premium possibilities.
| Mint / Type | Circulated | MS63–MS65 | MS67+ | Notes |
|---|---|---|---|---|
| 1970-P (No mark) | 25¢ (face value) | $1–$20 | $2,160–$2,750 | MS67+ extremely rare; only ~4 known at PCGS MS67+ |
| 1970-D | 25¢ (face value) | $1–$16 | $2,160–$15,000 | MS69 sold $15,000 (2023); check for all varieties below |
| 1970-S Proof | $2–$8 (impaired) | $8–$14 (PR69) | $450+ (PR69 DCAM) | Deep Cameo (DCAM) = heavy frosting + mirror fields; scarce |
Master Error & Variety Table
| Error / Variety | Designation | Mint | Rarity | Value Range | Top Auction |
|---|---|---|---|---|---|
| Proof / 1900 Barber Overstrike | — | S | 2 known | ~$75,000 | — |
| Proof / 1941 Canadian Overstrike | — | S | Unique/Near-Unique | $35,000–$40,000 | $40,000 |
| DDO FS-102 (WDDO-002) | FS-102 | D | Very Scarce | Up to $3,000 | — |
| DDO FS-101 (WDDO-001) | FS-101 | D | Scarce | $1,750–$2,500+ | — |
| Wrong Planchet (Cent) | — | D | Rare | $1,260+ | $1,260 |
| Off-Center Strike (50%+) | — | All | Scarce | $500–$1,020+ | $1,020 (70%, MS64) |
| DDR FS-801 (WDDR-001) | FS-801 | D | Scarce | $175–$650 | — |
| Dime Stock Thin Quarter | — | D | Uncommon | $30–$600 | $288 (AU53, GC) |
| DDR FS-802 (WDDR-002) | FS-802 | D | Scarce | $90–$400 | — |
| Wrong Planchet (Nickel) | — | D | Rare | $216–$325 | — |
| Off-Center Strike (10–20%) | — | All | Uncommon | $50–$125 | — |
| Clipped Planchet | — | All | Uncommon | $50–$100 | $99.95 (MS63) |
| Machine Doubling | — | D (mostly) | Extremely Common | Face value only | — |
1970 Washington Quarter Rare Errors & Varieties: Detailed Guide
The 1970 Washington Quarter offers three tiers of jackpots: legendary "midnight minter" Proof overstrikes at the San Francisco Mint, high-value die varieties from Denver, and dramatic planchet and strike errors. Below is every major variety with full diagnostics.
1970-S Proof Overstrikes: The "Midnight Minter" Coins
1970-S Proof quarter struck over a 1941 Canadian quarter. The underlying "1941" date and King George VI portrait are visible beneath Washington's design.
Origin & Background
San Francisco in 1970 operated as a tightly controlled facility dedicated exclusively to collector Proof coins. Yet somehow, a handful of these presses struck U.S. Proof dies onto foreign and obsolete domestic silver coins — an act requiring a human being to deliberately feed the host coin into the press. These are known as "midnight minter" errors, almost certainly the work of Mint employees creating rarities for personal profit.
Crucially, one example (the Canadian overstrike) was part of a collection auctioned by the State of California. Before the sale, the U.S. Secret Service inspected and cleared the coin for public sale — giving it a uniquely clean legal title that allows open trading.
The Two Known Types
- 1970-S over 1941 Canadian Quarter (PF65–PF66): The host coin is 80% silver. The date "1941" is clearly visible near the periphery. The profile of King George VI interacts with Washington's profile. Proof finish with frosted devices and mirrored fields is present, distorted by the underlying Canadian design. Graded PF65–PF66 by PCGS/NGC. Value: $35,000–$40,000.
- 1970-S over 1900 Barber Quarter (2 known): The host coin is 90% silver. Washington's profile is superimposed over the Barber Liberty Head on the obverse; the modern Heraldic Eagle sits atop the classic Barber Heraldic Eagle on the reverse. The overlapping designs create a chaotic, ghostly visual. This coin appeals to both Washington Quarter and Barber Quarter collectors simultaneously — "dual-market" demand. Value: ~$75,000.
1970-S Proof quarter struck over a 1900 Barber quarter. Both the Barber Liberty Head and the Barber Heraldic Eagle ghost through the modern Washington and Eagle designs.
How to Identify
- Look for a second portrait or date bleeding through underneath Washington's design
- The coin will weigh differently from standard clad (silver host = heavier, different density)
- Proof finish (mirror-like fields, frosted raised design) must be present
- Any text, stars, or design elements from another coin visible in the fields confirm an overstrike
False Positives to Avoid
Scratched or damaged coins with incuse marks are sometimes mistaken for overstrikes. A genuine overstrike shows complete, integrated underlying design elements — not random scratches. Fantasy pieces (coins altered outside the Mint) also exist; professional authentication is mandatory.
Auction Record
The Canadian overstrike has been listed privately at $40,000. Appraiser Mike Byers has valued it at $35,000–$40,000 (Mike Byers Inc.). The Barber overstrike has an estimated value of approximately $75,000.
1970-D Doubled Die Obverse FS-101 (WDDO-001) — The "King" of 1970 Varieties
Normal 1970-D (left) vs. DDO FS-101 (right). Strong split doubling is visible on the B and E of LIBERTY with a distinct raised secondary image — not the flat shearing of Machine Doubling.
Origin & Background
A Doubled Die (DDO = Doubled Die Obverse) occurs during die production, not during striking. When the master hub was pressed into the working die blank, if the die was slightly misaligned during a second squeeze, a second overlapping image was impressed into the die steel. Every coin struck from that die carries the same doubling — it is a characteristic of the die, not the coin.
How to Identify
- Strong, wide doubling on LIBERTY — the B and E show the clearest separation
- Significant thickening and splitting on IN GOD WE TRUST
- Visible secondary offset image on the 1970 date
- Doubling is rounded and raised — look for split serifs (the small feet at the base of letters)
- Class I Rotated Hub doubling — the secondary image is rotated slightly relative to the primary
- Visible with a 10x loupe; the strongest pickup points are on the B and E of LIBERTY
False Positives to Avoid
Machine Doubling (MD) is flat and shelf-like — the metal is sheared sideways, leaving a one-dimensional ghost image. Genuine DDO FS-101 doubling is rounded, raised, and has depth. Under 10x magnification, compare the letter edges: split serifs that stand up = real DDO; smeared flat ledge = MD with zero value.
Market Values
- • MS65: $1,750–$2,500
- • MS66+: $2,500+
1970-D Doubled Die Obverse FS-102 (WDDO-002)
1970-D DDO FS-102 showing doubling on all obverse lettering and the date. Different spread characteristics than FS-101 make careful comparison essential for attribution.
How to Identify
- Doubling visible on all obverse lettering: LIBERTY, IN GOD WE TRUST, and the date 1970
- Has different spread characteristics than FS-101 — compare spread direction and intensity carefully
- Rarer than FS-101 and potentially more valuable in Gem Mint State condition
False Positives to Avoid
Machine Doubling (flat and shelf-like) accounts for the vast majority of reported finds. When comparing FS-101 vs. FS-102, examine the direction and character of the spread — both are genuine and both are valuable, but correct attribution determines the price.
Market Values
- • MS65: Up to $3,000
1970-D Thin Quarter — Struck on Dime Stock
Scale showing a standard 1970-D quarter (5.67g) alongside a Dime Stock thin quarter (~4.2g). The weight difference is the definitive test.
Origin & Background
In 1970, Denver produced both dimes and quarters from copper-nickel clad strip — but the two denominations required different strip thicknesses. Quarter stock measured approximately 1.75mm; dime stock approximately 1.35mm. When a coil of dime strip was accidentally loaded into a quarter blanking press, the press punched out quarter-sized (24.3mm diameter) discs from the thinner metal. These thin blanks passed through the full production line and were struck as quarters — just with less metal than intended. An estimated 100,000 were struck, but far fewer survive in recognizable condition because vending machine mechanisms in the 1970s rejected them (too light), leading to many being discarded or scrutinized.
How to Identify
- Weigh the coin on a 0.01g precision scale: standard quarter = 5.67g; Dime Stock quarter = ~4.2–4.3g
- The coin is uniformly thin across its entire surface — not thicker in the center or on one side
- LIBERTY and QUARTER DOLLAR often fade into the rim (insufficient metal to fill die edges)
- High points (eagle's breast feathers, Washington's hair) appear weak even on uncirculated examples
False Positives to Avoid
A worn circulated quarter at normal weight is not a Dime Stock error. A coin that was filed, ground, or buffed post-mint will show uneven thickness and tool marks — and environmental damage never reduces weight. The scale is definitive: 5.67g = common; 4.2g = possible error.
Auction Record
$288 for a PCGS AU-53 example (GreatCollections). A Heritage Auctions listing noted a PCGS AU58 example (Heritage Auctions archive). Raw examples on eBay have listed as high as $1,500, but typical realized prices are closer to $250.
1970-D Doubled Die Reverse FS-801 (WDDR-001)
1970-D DDR FS-801: clockwise rotational spread on UNITED STATES. Split serifs are visible on the U, confirming Class I and Class V hub doubling. Compare to normal lettering at left.
How to Identify
- Primary pickup point: the U in UNITED — look for clockwise rotational spread and split serifs
- CW rotational spread visible on all of UNITED STATES OF AMERICA lettering
- Doubling on lower branches, leaves, inside wing feathers, and stems of the eagle
- Medium spread also visible on QUARTER DOLLAR lettering
- CONECA designation: 1-R-II-E (Class I Rotated Hub + Class V Pivoted Hub)
False Positives to Avoid
Machine Doubling is flat and shelf-like with no value. Also watch for confusion with FS-802 — FS-801 has a clockwise rotational spread, while FS-802 has a northeast spread. The direction is your key diagnostic.
Further Reference
See the diagnostic page at Variety Vista WDDR-001 for detailed attribution images.
1970-D Doubled Die Reverse FS-802 (WDDR-002)
1970-D DDR FS-802: northeast spread on E PLURIBUS UNUM. Doubling is most visible on the left side of the motto. Contrast with FS-801's clockwise rotational pattern.
How to Identify
- Primary pickup point: E PLURIBUS UNUM — doubling visible on the left side of the motto
- Spread direction is northeast — the key distinction from FS-801's clockwise rotation
- Light to moderate doubling on UNITED STATES with distinct split serifs
False Positives to Avoid
Machine Doubling (no value). When comparing to FS-801, always check spread direction first — northeast = FS-802; clockwise rotational = FS-801. Both varieties require correct attribution for accurate pricing.
1970 Quarter Off-Center Strike
1970-D quarter struck 70% off-center (right) compared to a normal coin (left). The design is compressed to one side with a large crescent of blank planchet. This example sold for $1,020.
How to Identify
- A smooth, crescent-shaped blank area where the design did not strike
- Value scales dramatically with severity — estimate the off-center percentage
- Retaining a readable date is critical; dateless examples are worth significantly less
- The blank area should have a smooth, natural planchet surface with no tool marks
Auction Record
A 1970-D quarter struck 70% off-center (MS64) sold for $1,020 in 2021. This result demonstrates the premium collectors place on severity and eye appeal.
1970-D Quarter on Wrong Planchet
1970-D quarter struck on a Lincoln cent planchet (left): copper-colored, undersized, most of the design missing. Struck on nickel planchet (right): near-normal size but wrong weight and edge characteristics.
How to Identify
- Struck on nickel planchet: weighs approximately 5.0g (vs. 5.67g standard); slightly different edge characteristics
- Struck on cent planchet: visibly copper-colored; significantly undersized diameter; much of the quarter design is missing because the smaller planchet could not fill the dies
- Always weigh and measure — environmental damage cannot alter weight or diameter
Auction Record
$1,260 for a 1970-D struck on a cent planchet. Nickel planchet examples: $216–$325.
1970 Quarter Clipped Planchet
1970-D curved clip error. The Blakesley Effect — a weak rim directly opposite the clip — confirms this occurred before striking. The clip edge is smooth, not tool-cut.
How to Identify
- Look for a curved, straight, or ragged missing section along the coin's edge
- Check for the Blakesley Effect: a weak or missing rim area directly opposite the clip — this confirms it is a genuine pre-strike mint error
- The clip boundary should be smooth and natural, not jagged
Auction Record
$99.95 for a 1970-D straight clip (ANACS MS63).
1970 Washington Quarter Traps: Common False Alarms
These are the most common reasons collectors think they have something valuable — and don't. Save yourself disappointment by learning to spot these quickly.
⚠️ Machine Doubling (MD) — The #1 Trap for 1970-D Quarters
A second, shadow image of the date, LIBERTY, IN GOD WE TRUST, or reverse lettering. Extremely common on 1970-D quarters due to overworked presses and the hardness of clad planchets causing die movement on impact.
A loose die shifts slightly the moment it strikes the planchet, shearing the metal sideways. This happens during striking — not during die production. It creates a flat, shelf-like smear, not a genuine second impression.
The critical distinction: Machine Doubling (left) is flat and shelf-like with sheared metal. Genuine DDO (right) is rounded and raised with distinct split serifs. 99% of "doubled" 1970-D quarters are the worthless left example.
- Machine Doubling is flat and shelf-like — the ghost image has no height or depth
- No split serifs — the secondary image is a smear, not a distinct raised letter
- True Doubled Die (DDO/DDR) has rounded, raised secondary lettering with visible split serifs
- 99% of "doubled die" 1970-D quarters reported online are Machine Doubling with zero premium
Value: Face value only (25¢).
⚠️ Die Deterioration (DD) — "Mushy" Details Are Normal for 1970-D
Fuzzy, indistinct lettering and weak high-point detail (hair, feathers) even on what appear to be uncirculated coins. Sometimes a hazy, textured field with flow lines (radial streaks toward the rim).
Denver struck over 417 million quarters in 1970 at a relentless pace. Clad planchets are much harder than silver and wore the steel dies rapidly. Late-stage dies produced coins with deteriorated detail — entirely normal for this date.
- Die deterioration doubling creates fuzzy, shelf-like halos on lettering — not split serifs
- Flow lines and mushy details are standard quality characteristics for 1970-D production
- These features do not add numismatic value
Value: Face value only (25¢).
⚠️ Post-Mint Damage (PMD) — Not a Mint Error
Unusual color changes (copper, gold, dark), strange surface texture, dents, gouges, or unusual shapes — sometimes mistaken for planchet errors or wrong-metal strikes.
Coins are subjected to chemicals, heat, physical damage, and plating after they leave the Mint. These post-mint alterations are not errors and have no collector premium.
- Post-mint color change does not change the coin's weight — a scale eliminates most confusion
- Genuine planchet errors are uniform in color and weight across the whole coin
- Jagged or tool-marked edges indicate post-mint cutting, not genuine clips or off-centers
Value: Face value only (25¢).
⚠️ Counterfeit or Added Mintmark — Especially on S-Mint Coins
An S-mint mark on what appears to be a business-strike (non-Proof) 1970 quarter, or a D or S mint mark that looks slightly raised, differently positioned, or shows signs of tooling around it.
1970-S quarters were only made as Proof coins. A non-Proof S-mint quarter is highly suspicious and may have an added mint mark — a common form of coin alteration. Similarly, D mint marks may be added to Philadelphia coins to create false rarities.
- A genuine 1970-S has Proof characteristics: mirror-like fields and frosted, sharp devices. No business-strike 1970-S should exist.
- Under magnification, an added mint mark may show glue residue, tool marks, or slightly different metal color around the mark
- If uncertain, submit to PCGS or NGC for authentication before assigning any value
Value if altered: Face value or less.
1970 Washington Quarter Grading: How Condition Affects Value
Grade (condition) has an enormous impact on value for 1970 quarters — especially for Philadelphia coins and Registry Set-quality Denver examples. Coins are graded on the Sheldon scale from 1 (barely identifiable) to 70 (perfect).
| Grade Range | Description | 1970-P Value | 1970-D Value |
|---|---|---|---|
| G–VF (Circulated) | Visible wear on hair and feathers; design readable | 25¢ | 25¢ |
| MS63–MS65 | No wear; moderate to minimal bag marks; full luster | $1–$20 | $1–$16 |
| MS66 | Above average strike; very few marks | $50+ | $30+ |
| MS67+ | Near-perfect; extremely rare for 1970-P (only ~4 known at PCGS MS67+) | $2,160–$2,750 | $2,160–$2,500 |
| MS69 | Virtually flawless; trophy-level Registry Set piece | — | $15,000 (eBay 2023) |
The jump from MS65 to MS67 is exponential — not linear — because 1970 quarters suffered severe bag mark damage in canvas transport bags at the Mint. Finding a coin that escaped without deep contact marks is genuinely rare. For Proof coins, look for Deep Cameo (DCAM) designation: heavy frosting on devices + jet-black mirror fields = up to $450+ at PR69.
1970 Washington Quarter Authentication: When to Get It Certified
Professional authentication by PCGS (Professional Coin Grading Service) or NGC (Numismatic Guaranty Company) is strongly recommended for any 1970 quarter you suspect may be a valuable error or variety. Here's when it is worth the cost:
- Any suspected Dime Stock thin quarter (weighs ~4.2g) — certification confirms authenticity and enables selling at full market value
- Any suspected DDO or DDR variety (FS-101, FS-102, FS-801, FS-802) — attribution by a third-party grader is essential; buyers will pay premiums only for certified examples
- Any off-center strike above 20% — certified errors command dramatically higher prices than raw (ungraded) examples
- Any wrong-planchet error — the unusual weight and color must be officially confirmed
- Any coin you believe may be a Proof overstrike — these are so rare and valuable that authentication is not optional
- Any S-mint coin that does not appear to be a Proof — the mint mark must be confirmed genuine by professionals
- Any coin at MS66 or above — Registry Set collectors require certified grades; raw coins in this range are essentially unsellable at full value
⚠️ Before Submitting
Do NOT clean, wipe, or dip your coin. Any cleaning — even with a soft cloth — permanently damages the surface under magnification and will result in a "Details" grade that destroys the coin's premium value. Handle by the edges only.
Dealer referrals and local numismatic club information: contact the American Numismatic Association (ANA) at money.org for a dealer directory near you.
1970 Washington Quarter Errors: Frequently Asked Questions
How do I tell if my 1970-D quarter is a genuine Doubled Die or just Machine Doubling?
Use a 10x loupe on the letters LIBERTY and IN GOD WE TRUST. Genuine Doubled Die (DDO FS-101) shows rounded, raised secondary images with split serifs — tiny separate "feet" visible on each letter. Machine Doubling shows a flat, shelf-like smear where the metal is sheared sideways. If the doubling has any height or a distinct second image with its own serifs, it may be genuine. If it looks like a flat shadow pressed against the main letter, it is Machine Doubling worth nothing.
My 1970-D quarter feels lighter than normal. Is it a Dime Stock error?
Possibly — but you need a scale to confirm. Weigh it on a digital scale with 0.01g precision. Standard quarter: 5.67g. Dime Stock error: approximately 4.2–4.3g. If it measures around 4.2g and the rim lettering is uniformly weak (not just worn), you likely have a genuine error. Confirm it is uniformly thin across the whole surface — filed or ground coins show uneven thickness.
Why does my 1970-P quarter have such poor detail even though it appears uncirculated?
Philadelphia quarters from 1970 are notoriously weakly struck. The Mint was under pressure to produce coins quickly, and the hardness of clad planchets eroded dies faster than silver ever did. Most 1970-P quarters that technically grade Mint State still show incomplete hair detail, mushy eagles, and significant bag marks from canvas transport bags. This is a characteristic of the production run, not an error, and does not add value.
Is the 1970-S Proof overstrike on a Canadian quarter real, or just a story?
It is absolutely real. The coin was part of a collection auctioned by the State of California, and before the sale, the U.S. Secret Service inspected and cleared it as legal to own and sell. PCGS certified it at PF66. Numismatist Mike Byers has valued it at $35,000–$40,000. The Barber Quarter overstrike (approximately $75,000) is also confirmed with two known specimens. These are intentional "midnight minter" errors — almost certainly created by a Mint employee who fed the host coins into the press.
My 1970-S quarter doesn't look like a Proof — is it worth anything special?
1970-S quarters were exclusively produced as Proof coins for annual collector sets. If your S-mint coin lacks mirror-like fields and frosted devices, the mint mark may have been added post-mint — a known form of alteration. Do not assign special value without professional authentication. If the coin genuinely is a non-Proof S-mint quarter, that would be extraordinary and would require immediate submission to PCGS or NGC.
What is the difference between FS-801 and FS-802 on the 1970-D reverse?
Both are Doubled Die Reverse (DDR) varieties from the Denver Mint, but they come from different dies with different doubling patterns. FS-801 (WDDR-001) has a clockwise rotational spread — look for split serifs on the U in UNITED. FS-802 (WDDR-002) has a northeast spread direction — primary pickup point is the left side of E PLURIBUS UNUM. FS-801 is considered the scarcer key DDR variety; FS-802 can show visually stronger doubling in some areas. Both require correct attribution for accurate pricing.
My 1970 quarter has a missing chunk from the edge. Is it a clipped planchet?
It might be — look for the Blakesley Effect: a weak or missing rim area on the opposite side of the coin from the missing chunk. This effect is caused by the way the blanking press works and confirms the clip happened before the coin was struck at the Mint. If the missing area has smooth, natural edges (not jagged or tool-marked), and the Blakesley Effect is present, you likely have a genuine clipped planchet worth $50–$100.
A 1970-D quarter on eBay is listed for $1,500 as a "Doubled Die." Is that realistic?
Almost certainly not. Most "doubled die" listings for 1970-D quarters on eBay are Machine Doubling — a common, worthless form of die shift. Even the genuine DDO FS-101 in circulated condition would sell for far less than that; premium prices only occur for certified Gem (MS65+) examples. Treat any raw, uncertified "doubled die" 1970-D listing with serious skepticism, and learn the visual difference between Machine Doubling (flat) and genuine DDO (rounded, raised split serifs) before bidding.
Research Methodology & Sources
Values and diagnostics in this guide are derived from the following primary sources, current as of January 2026:
- PCGS CoinFacts — 1970-P Washington Quarter
- PCGS CoinFacts — 1970-D Washington Quarter
- PCGS CoinFacts — 1970-D DDR FS-801
- PCGS CoinFacts — 1970-S Washington Quarter (Proof)
- NGC Coin Explorer — 1970-S Proof Washington Quarter
- Mike Byers Inc. — 1970-S Proof Overstrike on 1941 Canadian Quarter (PF66)
- Heritage Auctions — 1970-D Dime Stock Error (AU58)
- Variety Vista — 1970-D WDDR-001 Diagnostic
- Coin World — 1970-D Quarter Struck on Dime Stock
- NGC — Double Dies vs. Machine Doubling (Educational)
Prices shown are typical retail estimates as of January 2026 and may vary based on market conditions. Professional authentication by PCGS or NGC is recommended before buying or selling any coin discussed in this guide.
A note on images: To help illustrate coin diagnostics and rare varieties — especially complex errors that are difficult to describe in text alone — this guide uses AI-generated images. All written values, diagnostics, and variety attributions have been manually reviewed against the cited sources above. While our editorial team works to ensure every image is accurate and helpful, AI-generated illustrations may occasionally misrepresent fine details. If you spot any discrepancy between an image and its written description, please contact us or leave a comment below — we review all feedback and correct errors promptly. Numismatic knowledge is a community effort, and your input helps us build a more accurate resource for everyone.
