1999 Susan B. Anthony Dollar Errors: Value Guide & Rare Varieties

In 1999, eighteen years after it was retired, the Susan B. Anthony dollar was brought back from the dead. The reason: a vending machine crisis while the new Sacagawea dollar was still months away. The U.S. Mint pressed out more than 41 million coins in a matter of months — and that rushed production planted the seed for one of the most exciting mint errors in modern coinage. See our complete 1999 SBA dollar value guide here. If you're holding a coin with a gold or greenish-gold hue that feels slightly light in the hand, this guide will walk you through exactly what to do next — it could be worth five figures.

1999 Susan B. Anthony Dollar Specifications & Mintage

Before searching for errors, know exactly what a normal 1999 SBA dollar looks like. Any meaningful deviation from the specs below — especially in weight — is your first indicator that something unusual is present.

For standard coin values across all grades, see our full 1999 SBA dollar value guide.

1999 SBA Dollar Quick Checks: Do You Have Something Valuable?

Run through these three checks in order. The first two identify potential high-value errors. The third prevents the most common disappointment in 1999 SBA collecting.

1999 Susan B. Anthony Dollar Error & Variety Value Table

Values as of January 2026. Error coin values vary significantly based on grade, eye appeal, and market demand. Professional authentication strongly recommended for any coin over $100 in estimated value.

1999 Susan B. Anthony Dollar Rare Errors: Detailed Jackpot Guide

Each section below provides a deep-dive on a confirmed high-value error: where it came from, exactly how to identify it, what can fool you, and what it's worth. Work through each one that fits your coin before spending money on professional grading.

1999-P Experimental Planchet (The "Grail" of 1999)

Normal silver 1999 SBA dollar (left) vs. the rare Experimental Planchet showing its characteristic gold hue (right).

Origin & Background

While the U.S. Mint rushed to produce 41 million SBA dollars in 1999, it was simultaneously testing experimental planchets for the Sacagawea dollar set to debut in 2000. The Sacagawea coin required a unique manganese-brass alloy (77% Cu, 12% Zn, 7% Mn, 4% Ni) to achieve its gold color and a specific electromagnetic signature compatible with vending machines. During testing at Philadelphia, a failure in planchet segregation protocols allowed a small number of these gold-colored manganese-brass blanks to enter presses loaded with 1999-dated SBA dies. The result: a coin bearing the SBA portrait and design but struck on a Sacagawea-alloy planchet.

How to Identify

• Color: A distinct burnished gold or greenish-gold hue. This color is intrinsic to the alloy — it cannot be wiped off or peeled. Over 25+ years, the manganese has caused many genuine examples to develop a greenish oxidation or verdigris, giving them a green-gold patina that is itself a tell-tale sign.
• Weight (the decisive test): Use a digital scale with 0.01g precision. Genuine experimental planchet errors consistently weigh 7.3g–7.7g because the manganese-brass alloy has a lower density than the copper-nickel clad used for standard SBAs (8.10g).
• XRF confirmation: X-Ray Fluorescence (XRF) testing — used by PCGS and NGC — detects the unique spectral peaks for Zinc and Manganese, which are entirely absent from standard SBA clad. This is the definitive, non-destructive authentication method.

Digital scale showing a genuine experimental planchet at 7.73g (left) vs. a standard SBA or plated novelty at 8.10g (right). Weighing first saves time.

False Positives to Avoid

The overwhelmingly common false positive is the gold-plated novelty. Thousands of standard SBA dollars were professionally plated in gold and sold in 1999 as "Millennium commemoratives" or "collectible tributes." These are common, considered damaged by dealers, and carry no numismatic premium whatsoever. They weigh 8.1g or more — plating adds material. If a coin weighs 8.1g+, it is plated. Full stop.

Market Values

• Confirmed example, PCGS MS66: $10,575 (auction record, 2013)
• Current estimate (top-tier MS66+): $10,000–$16,000+

Auction Record

$10,575 for a PCGS MS66 example (Heritage Auctions, 2013). Given the appreciation of transitional error coins in the decade since, a contemporary sale is expected to realize significantly more. See also the GreatCollections record for a 7.73g PCGS MS-66 example.

1999-P Proof Doubled Die Obverse (DDO-001, CONECA)

Normal Proof LIBERTY (left) vs. DDO-001 showing split, notched serifs at letter corners (right).

Origin & Background

While mechanical doubling plagued 1999 business strikes, the Proof production line at Philadelphia generated a genuine Doubled Die Obverse (DDO). A doubled die forms when the working die receives two slightly misaligned impressions from the hub during the die-making process — the design itself is duplicated in the steel of the die before any coins are struck. Listed by CONECA as DDO-001, this is the only major die variety verified by multiple independent authorities for the 1999 date. Because Proof coins are struck multiple times at elevated pressure, the doubled detail is sharp and unmistakable.

How to Identify

• Examine the inscription LIBERTY and the date 1999 under 10x–20x magnification.
• True hub doubling shows split serifs — a clear notch or gap at the corners of letters where two distinct hub impressions slightly overlap. The serifs (the small horizontal strokes at letter ends) appear as if split or bifurcated.
• The doubled portion is raised at the same relief height as the primary image — not flat or shelf-like.
• Must be confirmed on a Proof coin: look for mirror-like flat fields (the background) and frosted (satiny) raised devices (the portrait and lettering).

False Positives to Avoid

Mechanical Doubling on business strikes is flat, shelf-like, and adds zero value. The DDO-001 variety is verified only on Proof strikes. Any business strike showing doubling is almost certainly Mechanical Doubling. Do not waste money submitting a business strike for DDO attribution.

Market Values

• Standard 1999-P Proof in PR69: $15–$25
• Attributed DDO-001 Proof: $50–$150 (depending on doubling severity and grade)

Auction Record

Market data is limited for this variety, as the modern Proof variety market is a niche. Values are estimates based on premiums generally paid for comparable modern doubled dies. Consult the CONECA Master Listings for SBA dollars for the most current attribution data.

1999 SBA Off-Center Strikes

Off-center severity progression: minor 5% (left), moderate 25% (center), and major 50% with full date visible (right).

Origin & Background

An off-center strike occurs when a blank planchet is not properly positioned in the retaining collar when the dies close. The dies strike only a portion of the planchet, leaving a crescent-shaped blank area. The high-volume, compressed timeline of the 1999 production run strained quality control, allowing these errors to escape undetected.

How to Identify (Value by Severity)

• Minor (<10%): Rim is wider on one side; full design still visible. $5–$15.
• Moderate (10–40%): A clearly visible crescent-shaped blank area with significant design loss. $50–$150.
• Major (40–60%): Substantial blank area; the date must be visible for maximum value. $200–$400+.
• Extreme (>60%): Majority of coin is blank; if the date is cut off, value drops to $50–$100.

False Positives to Avoid

Post-mint damage from machinery or being run over can create a coin with a shifted, deformed appearance. Genuine off-center coins have a smooth, undamaged blank crescent with no tool marks, scratches, or gouges on the unstruck portion.

Auction Record

~$216 for a moderate off-center example graded MS64.

1999 SBA Broadstrikes

Broadstruck 1999 SBA (right) showing noticeably wider diameter and smooth edge where reeding should be.

Origin & Background

A broadstrike occurs when the retaining collar — the ring that surrounds the planchet during striking to form the reeded edge and control diameter — fails to deploy. Without containment, the metal flows outward freely. The coin becomes wider than 26.5mm with a smooth or irregular edge rather than normal reeding.

How to Identify

• Measure with calipers: coin will exceed 26.5mm in diameter.
• The edge will lack reeding — smooth, wavy, or irregular instead of the characteristic ridges.
• The full design should be present but may appear slightly spread out or flattened.
• Metal flow is even and uniform in all directions outward.

False Positives to Avoid

Post-mint damage from being run over or flattened can widen a coin and remove reeding. Genuine broadstrikes show clean, even metal flow with no gouges, tool marks, or scratch patterns indicative of post-mint damage.

Auction Record

~$50 for an ungraded example.

1999 SBA Double Struck

Double struck 1999 SBA dollar with two overlapping impressions visible — two dates and two portrait impressions are present.

Origin & Background

A double-struck coin passed through the press and received a second impression from the die. In an in-collar double strike, the second hit lands close to the first, causing overlapping design elements. In a dramatic flipover double strike, the coin flips between the two strikes, imprinting one side of the design onto the other.

How to Identify

• Look for two complete sets of design elements — two full dates, two portraits — clearly separated and both at full relief.
• In-collar strikes show close overlap; flipover strikes show a mirrored impression of the obverse design on the reverse (or vice versa).
• All second-impression elements are fully formed and raised — not flat or smeared.

False Positives to Avoid

Mechanical Doubling from a single strike produces flat, shelf-like distortion. True double strikes show a complete second impression of design elements at full relief — as distinct and sharp as the primary design.

Auction Record

$552 for a PCGS-certified example.

1999-P SBA Struck on Wrong Planchet (Cent or Nickel)

1999 SBA dollar design on a Lincoln cent planchet (right) — dramatically undersized with design cut off at the edges.

Origin & Background

Perhaps the most visually dramatic errors in the series, wrong planchet strikes occur when a blank intended for a different denomination enters the press. Verified examples include 1999 SBA designs struck on Lincoln cent planchets (copper/zinc) and Jefferson nickel planchets. Because the dollar die is far larger than a cent or nickel blank, the resulting coin is misshapen and shows the design truncated where the planchet edge falls short of the die.

How to Identify

• The coin is dramatically undersized relative to a standard dollar.
• A cent planchet weighs approximately 2.5g and measures 19mm; a nickel planchet weighs approximately 5.0g and measures 21.2mm.
• The SBA design will be incomplete — elements cut off where the edge of the smaller planchet falls short of the die.
• Metal color may differ from standard silver-toned clad (cent planchets are copper-colored).

False Positives to Avoid

Novelty coins, tokens, and post-mint ground-down coins can appear similar. Genuine wrong planchet errors show clean, mint-quality strikes on the wrong-sized blank with no evidence of filing, tooling, or edge alteration.

Auction Record

~$4,000 for a 1999 SBA struck on a Lincoln cent planchet (market data limited due to extreme rarity).

1999 SBA Clipped Planchets

Clipped planchet 1999 SBA showing the curved clip (top) and Blakesley Effect — rim weakness directly opposite (arrow, bottom).

Origin & Background

A clipped planchet occurs when the blanking punch cuts into a portion of the metal strip that has already been punched (curved clip) or at the very end of the strip (straight clip). The result is a coin blank with a section missing.

How to Identify

• A section of the edge is missing — smooth, with no tool marks on the cut surface.
• Look for the Blakesley Effect: a subtle weakness in the rim detail directly opposite the clip. This occurs because the missing metal prevents hydraulic pressure from fully forming the rim on the opposing side. No Blakesley Effect = suspect post-mint damage.
• Minor clip: $5–$15
• Major clip (>15% of coin): $30–$75
• Straight clip (end-of-strip): $40–$100

False Positives to Avoid

Post-mint damage from punches, pliers, or tools can remove sections of a coin's edge. Genuine clips always exhibit the Blakesley Effect. A sharp, complete rim directly opposite the "missing" section strongly indicates post-mint damage.

1999 SBA Dollar Common Traps: What Looks Rare But Isn't

These four traps account for the vast majority of 1999 SBA "error" coins brought to dealers — and sent back as face value. Know them before you get excited.

⚠️ Trap 1: The Gold-Plated Novelty Coin

What You See:

A 1999 SBA dollar with a gold or gold-tone color — exactly what you've heard described as the rare experimental planchet error.

Why It Happens:

In 1999, third-party marketers sold thousands of standard SBA dollars that had been gold-plated as "Millennium commemoratives" or "collectible tributes." They are common novelties considered damaged by the numismatic community.

How to Tell It's NOT Valuable:

• Weigh on a 0.01g scale: 8.1g or more = plated novelty. A genuine experimental planchet weighs 7.3g–7.7g.
• Look for flaking or peeling at the coin's edges or high points — post-mint plating is not intrinsic to the alloy.
• No experimental planchet errors from Denver are known. A gold-colored 1999-D is effectively certain to be plated.

Gold-plated novelty (left) with visible surface flaking vs. genuine experimental planchet (right) with uniform, intrinsic gold-green tone.

Value: Face value only ($1.00).

⚠️ Trap 2: Mechanical Doubling (The "Machine Double")

What You See:

A doubled or shadowed appearance on the date "1999," mintmark, or lettering under a magnifying glass — resembling what you'd expect a valuable doubled die to look like.

Why It Happens:

The 1999 dies were pressed into service rapidly and used well beyond their optimal lifespan to meet the 41-million-coin quota. Worn, loose dies cause Mechanical Doubling (MD) — the die shifts slightly mid-strike, smearing metal sideways. It is ubiquitous on 1999 business strikes.

How to Tell It's NOT Valuable:

• MD appears as a flat, shelf-like ledge pushed to one side of letters — as if the metal was smeared.
• The secondary image is lower in relief (flatter) than the primary device.
• True hub doubling (Proof DDO-001 only) shows raised, notched split serifs where two impressions overlap at equal height.

Mechanical Doubling (left) — flat, shelf-like, worthless — vs. true Hub Doubling (right) showing raised split serifs of equal height.

Value: Face value only. No exceptions for business strikes.

1999 SBA Dollar Grading: How Condition Affects Value

Coins are graded on a 1–70 scale (called the Sheldon scale). For 1999 SBA dollars, grade has a dramatic effect on value — but only at the very top of the scale. Here's what matters:

• MS60–MS66 (Mint State, uncirculated): The vast majority of hoarded 1999 SBAs fall here. These grades are extremely common due to mass hoarding. Professional grading costs ($30–$50) typically exceed the coin's market value at these grades. Avoid submitting unless you suspect a genuine error.
• MS67–MS68 (Condition Rarity): Due to the poor die quality of the rushed 1999 production run, coins achieving MS67 or MS68 are genuine condition rarities and command a meaningful premium over common examples. If your coin looks flawless under magnification, consider submitting to PCGS or NGC.
• Circulated grades (AG–AU): Worth face value only in all cases, regardless of mint.
• PR69 (Proof): Standard 1999-P Proof value is $15–$25. Examine under magnification for the DDO-001 variety before submitting, as that variety commands $50–$150 attributed.

For any suspected genuine error — experimental planchet, off-center, wrong planchet, double struck — professional certification by PCGS or NGC is essential before any sale or significant transaction.

1999 SBA Dollar Authentication: Tools, Tests, and When to Submit

Required Tools for Home Screening

• 10x–20x Achromatic Loupe: A magnifying loupe that shows 10–20x magnification with clear, undistorted edges. Essential for distinguishing the flat, shelf-like appearance of Mechanical Doubling from the raised, notched split serifs of a true hub doubled die.
• Digital Gram Scale (0.01g precision): The single most important tool for this issue. A scale rounding to 0.1g is insufficient — the difference between a light-tolerance standard coin (7.9g) and a heavy experimental planchet (7.7g) requires decimal precision.
• Calipers: For measuring diameter (26.5mm standard) to identify broadstrikes and wrong planchet errors.
• Strong Rare-Earth Magnet: Standard SBA (Cu-Ni) and experimental (Mn-Brass) alloys are both non-magnetic. A coin that strongly sticks to a magnet is a counterfeit or a plated steel slug — not a genuine SBA or experimental planchet.

Stop / Go Decision Framework

Submitting to PCGS or NGC

For the experimental planchet error, PCGS and NGC use X-Ray Fluorescence (XRF) testing to non-destructively confirm the presence of Zinc and Manganese — elements that are absent from standard SBA copper-nickel clad but present in the Sacagawea manganese-brass alloy. This is the definitive authentication method. See PCGS CoinFacts for the 1999-P SBA dollar for current grading fees and submission instructions.

For reputable dealer referrals on high-value error coins, consult the American Numismatic Association (ANA) dealer directory or contact major auction houses such as Heritage Auctions and Stack's Bowers directly.

1999 Susan B. Anthony Dollar Errors: Frequently Asked Questions

1999 SBA Dollar Error Research: Sources & Methodology

All values, diagnostics, mintage figures, and auction records in this guide are drawn from verified sources as of January 2026. The experimental planchet auction data is robust but limited in volume due to extreme rarity (census <20). The Proof DDO-001 valuation is an estimate based on premiums for comparable modern doubled dies; deep auction comparable data is limited for this niche market. No Wide Rim variety exists for 1999; this was confirmed against all major variety databases.

• PCGS CoinFacts — 1999-P SBA Dollar (business strike)
• PCGS Auction Prices — 1999-P Experimental Planchet
• Mint Error News — SBA Experimental Planchet Discovery & Diagnostics
• CONECA Online — SBA Dollar Master Variety Listings (DDO-001)
• NGC Coin Explorer — 1999-P SBA Dollar
• GreatCollections — Experimental Planchet (7.73g, PCGS MS-66)
• Small Dollars — SBA Mintage Figures & Set Composition