16 Rare Dime Errors List with Pictures (By Year)

American dimes have been struck for over two centuries, and during that time, countless minting errors have occurred—some creating varieties worth hundreds or even thousands of times their face value.

Before modern automation, mint employees manually punched dates and mintmarks onto individual working dies, creating numerous opportunities for mistakes. Dies were reused, recycled between facilities, and subjected to enormous striking pressures that caused metal fatigue and breakage. Each of these factors contributed to the collectible errors found on dimes today.

Many of these errors ceased occurring when the U.S. Mint modernized its production methods, making them finite historical artifacts. This guide examines sixteen major categories of dime errors, from doubled dies and overdates to weak strikes and die breaks, helping you identify potentially valuable varieties in your collection.

Looking for rare Dimes from other years?

• Auto Coin Appraisal Tool: Best Coin Identifier App
• (1946-Present):  Top 100 Most Valuable Roosevelt Dimes Worth Money List
• (1916 – 1945):  Top 70+ Most Valuable Mercury Dimes Worth Money
• Even Older?:  Top 100 Rarest Dimes Worth Money (Most Expensive)

 

Doubled Die Dime Errors

1. Doubled Die Obverse (DDO) Errors

A Doubled Die Obverse error happens during die manufacturing, not coin striking. The mint uses a hub stamp to create coin dies through multiple impressions. When the hub isn’t perfectly aligned during these impressions, the misaligned die produces coins with doubled images, letters, numbers, or words.

A genuine DDO shows clear, rounded doubling where both the primary and doubled images are the same height, appearing as separate, distinct images rather than smeared effects. This distinguishes it from mechanical doubling, which looks flat and shelf-like.

For Half-Dimes, the 1872 Seated Liberty DDO-001 is the most dramatic doubled die variety and not difficult to locate. However, specific market pricing for Half-Dime DDO varieties is limited in available auction records.

For Dimes with DDO errors, market values vary significantly based on the issue, grade, and doubling visibility. The 1960 Roosevelt Dime Doubled Die Obverse proof coin is worth around $163 or more. A 1967 Roosevelt Dime DDO graded AU-53 sold for $600. For older issues, the 1872 Seated Liberty Dime with doubled die is worth $307 in average condition and can reach $2,066 to $4,834 in uncirculated condition. An 1890 Seated Liberty dime DDO with doubling on the word LIBERTY typically sells for $400 to $1,200.

 

2. Doubled Die Reverse (DDR) Errors

DDR errors occur during die production when the working hub strikes the working die multiple times in slightly misaligned positions, causing doubling to appear on reverse elements like inscriptions and design features. The process involved heating blank dies to soften them before pressing them against hubs. Since one impression couldn’t fully transfer the design, multiple strikes were needed. After the first impression, dies were reheated for subsequent strikes. When proper alignment wasn’t maintained between impressions, doubled dies resulted.

Genuine DDR errors show both primary and secondary images raised equally from the coin’s surface, unlike mechanical doubling where the secondary image appears only half as high.

The DDR market remains less developed with generally lower premiums than DDO varieties because reverse doubling tends to be subtler and less visually striking than doubled dates or obverse lettering.

For Dimes, the 1872 Seated Liberty Dime DDR, discovered in 1999, shows the second hubbing rotated 175 degrees from the first strike with doubling in “ONE DIME.” These are worth $307 in average condition and $2,066 to $4,834 in uncirculated condition. Modern examples like the 1964-D Roosevelt Dime DDR have sold for $16 to $550 across grades 45 to 66.

 

Date-Related Die Dime Errors

3. Misplaced Date (MPD) Errors

Date digits punched where they don’t belong—that’s the essence of a Misplaced Date variety. These minting accidents happened when mint employees tested date punches on working dies, typically aiming for spots like denticles or the bust’s base where the strike would hide the error. The plan didn’t always work.

Between 1842 and 1908, MPDs appeared across nearly every U.S. coin series (the Three Cent Silver being the lone exception). The cramped work area on minor coins made these slips particularly common—one small hand movement could send a digit off course. Once the Mint began hubbing dates into master dies in 1909, the era of repunched and misplaced dates ended.

Most MPD digits hide 90-99% beneath the struck design. Search the denticles below the date, the lower portion of the bust, and hair details. On certain varieties, check specific areas like below the R in LIBERTY for digit fragments.

Premium examples command serious money: an 1854 Large Cent MPD in MS64 brought $300, while a 1906 Indian Head Cent MPD fetched $599. More accessible EF45 specimens typically sell around $30. Seated Liberty Dimes feature extensively cataloged MPD varieties, with values varying by rarity and visibility of the misplaced digits.

 

4. Repunched Date (RPD) Errors

A Repunched Date is the result of striking the date punch repeatedly with a hammer during die production. Until 1909, each die’s date was manually applied by hammering a steel punch into the die while it was annealed (in a soft state). This process sometimes created visible doubling or overlapping of the date digits on struck coins, with some examples showing subtle effects and others displaying obvious doubling.

The era of repunched dates ended in 1908 for U.S. coins. Beginning in 1909, the date was placed on the master hub or master die, eliminating this error type.

While both errors resulted from hand-punching, they differ significantly. RPMs involved mintmarks being struck twice and continued until 1989 when the U.S. Mint discontinued hand-punching mintmarks. RPDs only affected date numerals and ended in 1908—giving RPMs an 81-year longer production window. This makes RPDs exclusively 19th-century varieties, while RPMs appear throughout most of the 20th century. Both occurred when mint workers attempted to correct misaligned first impressions on working dies with repeated strikes.

For Half-Dimes, an 1858 Seated Liberty specimen with RPD is valued at $61 in average condition and $782-$1,582 in uncirculated condition. The 1833 Capped Bust Half Dime RPD is noted as a rare and sought-after variety.

RPDs on Half-Dimes and Dimes generally command higher premiums than RPMs, which typically trade for $5-$30 in circulated grades, due to their earlier cutoff date and greater scarcity.

 

5. Overdate Errors

An overdate is created when a fresh date is stamped onto a working die that already bears a different date, usually from the prior year. Mints did this deliberately to save money by recycling existing dies instead of making new ones, especially when dies were in short supply or leftover dies remained unused at the end of the year. Throughout the 1700s and 1800s, dates were manually punched into working dies to extend their useful life. This practice ceased in 1909 with the last Indian Head cents, as dates were subsequently added to the master hub or master die instead.

The physical process creates distinctive characteristics: as the new digit punch entered the die steel, it displaced metal sideways and upward, typically causing the earlier date to appear thinner and smaller than the later date on the finished coin.

The fundamental difference from RPDs is their origins differ significantly. Overdates resulted from intentional die recycling, while RPDs were unintentional positioning mistakes. This distinction explains why overdates command substantially higher premiums in the collector market.

A special category includes “inverted overdates” where numbers were first punched upside down, then corrected with properly oriented digits. These are rarer than standard overdates because they require two errors: inverted printing followed by corrective overwriting. Examples include the 1834 3/Inverted 3 and 1858 Over Inverted Date.

Market values reflect these rarity differences dramatically. For Half-Dimes, an 1849/8 Seated Liberty overdate graded PCGS MS-68 sold for $16,800, while comparable RPD varieties like the 1858 bring only $61-$1,582 depending on condition. Among Dimes, the gap is even wider: the 1942/1 Mercury Dime has reached $132,000 at auction and the 1942/1-D variant $106,000, whereas RPDs typically add only modest premiums to base values. Inverted overdates, due to their exceptional rarity and uniqueness, often command the highest premiums of all these die varieties.

 

Mintmark-Related Die Dime Errors

6. Repunched Mintmark (RPM) Errors

Before 1990, mint marks were manually punched onto working dies using a steel punch and mallet. If the first impression was misaligned or weak, a second blow at a different angle or position created repunched mint marks. Common causes included imprecise positioning, punch bouncing, non-vertical angles, or correction attempts. The era of RPMs ended in 1989 when mint marks began being placed on the master die.

RPMs differ from doubled dies by affecting only the mint mark rather than the entire design, and they result from hand-punching after die hubbing is complete. A “Horiz” (horizontal) RPM occurs when the first strike is at a horizontal angle, followed by a corrective vertical strike, creating overlapping mintmarks—one faint horizontal impression beneath the proper vertical one. Examples include 1953-D D/Horiz D, 1901-O O/Horiz O, and 1945-S S/Horiz S.

The value of these errors varies significantly based on the clarity of the repunching and overall coin grade. Most RPMs trade for $5-$30 in circulated grades. However, premium examples command substantially higher prices. For Half-Dimes, an 1848 Seated Liberty specimen with repunched date (PCGS MS-63) sold for $699.95.

Among Dimes, Mercury series RPMs show the strongest market performance. A 1944-S/S RPM graded PCGS MS-67 FB realized $8,225 at a 2006 Heritage Auction, while even circulated examples of this variety bring $100-$200.

 

7. Over Mintmark (OMM) Errors

When dies traveled from one mint to another, they needed new identification marks. Workers would file away the old mintmark and stamp a fresh one in its place, but the process was imperfect. Coins struck from these recycled dies reveal both marks—the newer one bold and clear, the older one faint and diminished, like a palimpsest of the die’s journey.

The manual punching process used from the 1830s through the 1980s created opportunities for such errors, as Philadelphia Mint employees prepared dies for all branch facilities and manually added mintmarks to working dies destined for Denver, San Francisco, and other locations. The critical difference from RPMs is that overmintmarks display two different mint letters—like D over S or S over D—while repunched mintmarks show the same letter struck multiple times.

The dime series holds special significance in OMM history: the 1838-O Seated Liberty dime was the first U.S. coin ever struck at a branch mint, inaugurating the era of mintmarks on American coinage. This pioneering role continued throughout the 19th century as dimes were produced at Philadelphia, New Orleans, San Francisco, and Carson City facilities. The practice of hand-punching mintmarks ended between 1990-1994 when mintmarks were incorporated into master dies and eventually into digital master models.

For Half-Dimes and Dimes, OMM varieties represent some of the most elusive discoveries in the series. The combination of careful die preparation and the coin’s smaller working surface made these errors exceptionally uncommon compared to larger denominations. 

 

8. Inverted Mintmark Errors

The inverted mintmark is a die variety error that resulted from the manual production methods used in U.S. coinage. Die technicians would add mintmarks to working dies by positioning a small steel punch bearing the mirror image of the letter and striking it with a hammer to press the image into the die. When this punch was inadvertently applied upside down, an inverted mintmark was created. All coins struck from that particular die would display the same inverted mark, making these recognizable collectible varieties.

Regarding the 1942-S Mercury Dime with inverted mintmark (FS-501), values vary significantly with condition. Recent sales over fifteen years have ranged from approximately six dollars for lower grades to over seven hundred dollars for premium specimens. Notable examples include a 1942-S MS-63 that realized nine hundred sixty dollars in July 2021 and an MS-64 with Full Bands that sold for two hundred forty-one dollars in January 2020. Higher mint state grades command substantial premiums, particularly when the coin exhibits Full Bands—sharp horizontal separation lines on the reverse fasces that indicate superior strike quality.

 

9. Missing Mintmark

Missing mintmark errors occur during die preparation when mintmarks were manually punched onto working dies by technicians, and these dies were then inspected for flaws or omissions. The 1982 No Mintmark dime resulted when a Philadelphia Mint employee inadvertently failed to add the “P” mintmark onto an obverse die, and this omission went unnoticed during inspection, allowing thousands of unmarked dimes to enter circulation. In contrast, the 1983 No S error occurred on proof dies prepared at Philadelphia for San Francisco, where the “S” mintmark was accidentally omitted.

“Strong” refers to strike strength. The 1982 No Mintmark dime exists in two versions: Strong and Weak. Experts believe mint employees increased striking pressure after noticing the weak strikes, creating the Strong version. The Weak-strike coins from Pittsburgh show a weaker “2” in the date positioned closer to the rim, while the Strong-strike examples from Sandusky, Ohio display crisp details with clear separation between the date and rim.

One collector noted that the Strong-strike version is thicker—a standard roll can hold only 47-48 Strong-strike coins, while the Weak-strike version can hold 50-51. The Strong-strike variety is more desirable to collectors due to its superior detail clarity. The 1982 No Mintmark Strong holds an auction record of $2,185 in MS-68 grade from 2004, while typical examples range considerably lower.

For the 1983 No S proof, a PCGS Proof-70 Deep Cameo example sold for $20,489.70 in 2016, and an NGC Proof-70 Ultra Cameo realized $3,840 in 2020. More common Proof-69 Deep Cameo examples typically sell for around $764.

 

10. Weak “S” Errors

Weak “S” errors are a die preparation issue that occurred during the mintmark application process at the San Francisco Mint, particularly on 19th-century coinage. These errors resulted from the manual process where mint technicians added mintmarks to dies using a small steel puncheon and hammer, pressing the mirror image into the working die.

When insufficient force was applied during this punching operation or when the puncheon didn’t penetrate deeply enough into the die surface, the resulting mintmark appeared weakly impressed on the struck coins. Both the Small Thin S and Small Weak S mintmarks could have originated from the same punch, with variations appearing based on the depth and pressure of the manual punching process.

The weak mintmark was so faint that on some circulated examples, it could be completely missing, causing confusion for collectors who might mistake San Francisco strikes for Philadelphia coins. This manufacturing characteristic particularly affected Seated Liberty dimes from the 1860s and early 1870s.

The 1866-S Weak S dime has an auction record of $366 for a VF25 example sold in February 2019. The 1869-S dime is noted for often coming weakly struck with mintmarks lacking definition, and according to expert Gerry Fortin, the entire mintage came from only two die pairs. For the 1869-S variety, an MS66 example achieved $9,200 at auction in June 2002, though standard circulated examples typically trade considerably lower.

 

Striking Dime Errors

11. Weak Strike Errors

Insufficient die pressure during minting creates weak strike errors where design elements appear faint or incomplete. These defects stem from mechanical failures in the coining press—excessive die clearance prevents complete metal flow into design recesses. Common causes include improperly secured ram adjustments, worn locking components, inadequate press capacity, or electrical disruptions during striking.

Weakly struck coins retain the planchet’s original beveled edges and proto-rim features while showing underdeveloped raised design elements. Dimes experience this problem more frequently than cents despite lower mintages because their thinner planchets require tighter tolerances, making them more sensitive to even minor clearance variations.

The 1954-S “No JS” Roosevelt dime exemplifies this error—the designer John Sinnock’s initials below the portrait fail to strike clearly due to insufficient pressure. A 1954-S Lincoln Cent graded MS65FB (Full Bands), referring to the fully detailed horizontal bands on the reverse Memorial—a desirable feature that enhances value. This coin sold for $135 on eBay in March 2018. Population data shows limited availability with only 17 coins graded at MS65 level, positioned between MS64 ($85) and MS66 ($250) grades, making it a relatively scarce collectible in this condition.

  

12. Off-Center Strike Errors

Off-center strike errors occur when a planchet is not properly positioned between the dies during the striking process, resulting in a coin with part of its design missing. The error occurs when planchets fail to seat correctly in the collar die—as the hammer die descends, the planchet shifts position, causing the design to strike only a portion of the blank metal disc. The percentage of off-centering determines value—a 50% off-center dime means approximately half the design is missing from the planchet surface.

Roosevelt Dimes are generally common as off-center strikes compared to larger denominations. A rare 1916 Mercury Dime graded struck 95% off-center achieved a value of approximately $5,000. Minor 5-10% shifts command modest premiums, while extreme examples where the date remains visible despite 50% or more displacement can fetch thousands of dollars.

 

13. Brockage Errors

A brockage error occurs when a previously struck coin fails to be ejected from the coining chamber and remains stuck to one of the dies. When the next planchet enters, it is struck on one side by the proper die and on the other by the stuck coin’s surface, creating a mirror-image incuse impression on the new planchet.

The error forms when a planchet struck between the hammer and anvil dies fails to eject properly. As subsequent planchets enter, each strike presses the new blank against the stuck coin rather than a proper die. The result is a coin with the intended design on one side and an incuse mirror image on the other, known as a “brockage.”

A 1988-P Roosevelt Dime with a broadstruck obverse brockage was authenticated and graded MS-66. While specific dime brockage values are limited, related die cap errors on larger denominations.

 

Planchet Dime Errors

14. Clipped Planchet Errors

A clipped planchet error occurs when the planchet strip is not fed properly into the blanking press or when there is a defect in the planchet strip itself, resulting in missing metal from a coin’s edge area. Three primary clip types result: curved clips (when blanking dies overlap previously punched holes), straight clips (when punches overlap the strip edges), and ragged clips (from blanks punched from defective areas). On curved-clip coins, the rim opposite the clip often shows a distinctive distortion called the Blakesley Effect.

Larger clips are worth more—a 75% clipped planchet Washington Quarter might be worth around $200, versus a 5% clip garnering perhaps $5. A Roosevelt dime with an extreme curved clip and full mint details was reportedly purchased for around $400,000, though such extreme examples are exceptional. A 1996-P Roosevelt Dime with a double clipped planchet was authenticated and graded AU-58.

 

15. Wrong Planchet Errors

Wrong planchet errors occur when planchets for one coin denomination are fed into a coin-stamping press equipped with dies of another denomination, resulting in a coin stamped with a design intended for a differently sized coin. These typically involve accidental mixing of planchet batches in the mint facility. The coin struck on an incorrect blank will weigh exactly what the denomination of that blank would have been, providing definitive authentication.

A 1942 Mercury Dime struck on an Ecuador 5 Centavos planchet graded Mint Error MS-62 FB realized $11,400 in July 2023. A 1999-D Roosevelt dime struck on a cent planchet is particularly notable—only two examples are known, and due to metal mixing, strange colors formed ranging from violet and blue-green to orange and gold. A specimen graded MS-65 was auctioned for $10,000.

 

Die Break Dime Errors

16. Die Break Errors

Die breaks occur when striking die fragments physically detach during production due to metal fatigue and stress fractures from repeated use. When fragments break away, they leave voids in the die surface, and during subsequent strikes, planchet metal flows into these voids, creating raised, featureless areas on coins. The most recognizable form is the “cud”—a marginal die break appearing as a raised blob typically adjacent to the rim. Value correlates directly with the size and dramatic nature of the break, with larger examples commanding higher premiums.

Researcher Gerry Fortin identified twelve die varieties for the 1854-O dime, with Fortin-106 featuring a heavily shattered obverse die. The severely shattered obverse paired with a large O mintmark. The massive raised die crack running through the date and arrows makes this variety highly desirable among Liberty Seated specialists.

Both F-102 and F-106 carry R6 rarity ratings (very rare), as the severely damaged dies couldn’t have lasted long in production. While standard 1854-O dimes trade between $18-62 in circulated grades and $524-1,232 in uncirculated condition, shattered obverse varieties command significant premiums. An F-102 graded G4 sold for $119 in May 2019, with values varying based on grade and the visibility of the dramatic die break.

 

Conclusion

The world of dime errors reveals how even small manufacturing imperfections can create significant numismatic value. The next time you examine a dime, look beyond its face value. Check for doubled letters, inspect the mintmark carefully, and examine the date for signs of repunching or overdating. While finding a $100,000 rarity remains unlikely, discovering a $50 or $500 error in circulation is entirely possible for those who know what to look for. Happy hunting!