Repunched Mint Marks (RPM): What They Are and What They Add
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Short on time? The essentials
- Until 1990 for cents and 1991 for other denominations, mint marks on US coins were hand-punched into each working die with a small steel rod after the rest of the design was already there.
- A repunched mint mark is created when that punch is struck twice in slightly different positions, so the coin shows a doubled or overlapping D, S, or CC letter.
- RPMs are different from doubled dies. On a doubled die the whole design shows doubling, because the working hub misaligned. On an RPM only the mint mark letter is doubled.
- Since 1990 to 1991, the mint mark has been placed on the master die, and since 1994 on the master design, so classic hand-punched RPMs cannot occur on newer coins.
- The main attribution authority is Wexler, who assigns each recognized RPM a number such as RPM-001 that dealers and grading services use in listings.
- RPMs are commonly faked or confused with machine doubling, die scratches, and grease-filled dies. Real RPMs show two raised, separated letter shapes, not a smeared shelf.
- Value depends on the coin date, the RPM number, the strength of the doubling, and the grade. Most RPMs add a small premium. A short list of famous RPMs commands strong premiums.
- The 1938-D over S Buffalo nickel was the first repunched mint mark of any United States coin to be recognized by collectors.
On this page
- What a repunched mint mark actually is
- Why RPMs exist only on older US coins
- RPM versus doubled die: the key distinction
- Well-known RPMs collectors watch for
- How to spot an RPM under 10x magnification
- Wexler numbers and how attribution works
- What drives the premium on an RPM
- Look-alikes: machine doubling, die gouges, plating flaws
- A worked identification walkthrough
- Counterfeits and altered mint marks
- When third-party grading is worth the fee
- What your coin is probably not
- Repunched mint mark FAQ
What a repunched mint mark actually is
A repunched mint mark is a die variety. It happened at the working die stage, before any coin was struck. The doubling is engraved into the die itself, so every coin later struck from that die carries the same doubled mint mark.
Every classic RPM has the same origin story. A die maker at the United States Mint held a small steel rod, called a punch, with a raised mint mark letter on the tip. The maker pressed or struck the punch into the face of a finished working die to add the D, S, or CC letter that identified the mint. If the punch was struck twice and shifted between blows, the die kept both impressions.
When that die then went into the coin press, every coin it struck showed the mint mark as two overlapping letters. The rest of the design looked normal, because only the mint mark punch was misaligned. That single-letter doubling is the signature that separates an RPM from every other mint event.
On the coin, the two impressions can sit side by side, stacked north and south, tilted, or almost fully overlapped with a shadow ridge at one edge. Serious varieties show two clearly formed letters with clean gaps. Weaker varieties show a small secondary ridge next to the primary letter under magnification only.
Why RPMs exist only on older US coins
Classic RPMs are a product of an older die-making process. Until 1990 for the cent and 1991 for other circulating denominations, the mint mark was the very last design element added to a working die. It was applied by hand at the working die stage. That hand step is what made repunched mint marks possible.
In 1990 and 1991 the Mint began applying the mint mark to the master die for circulation strike coins. From 1994 onward the mint mark was placed on the master design that generated the working hubs. Once the mint mark rode on the master and passed through hubbing along with the rest of the design, the small hand-punching step that produced classic RPMs was gone.
That is why RPM listings for a series stop cleanly around 1990 or 1991. A 1989-D cent can be an RPM candidate. A 1995-D cent cannot, because the D was already engraved into the master die that made its working dies. Similar cutoffs apply to nickels, dimes, quarters, and halves.
Modern coins can still show mint mark oddities. Misplaced mint marks, doubled mint marks from single-squeeze hubbing, and small mint mark gouges do turn up. Those are cataloged as different varieties, not as classic hand-punched RPMs, and they usually carry smaller premiums than the well-known older RPMs.
RPM versus doubled die: the key distinction
The single most useful rule for reading a coin variety is this. On a repunched mint mark, only the mint mark shows doubling. On a doubled die, the design elements from the hub show doubling, and the mint mark itself usually looks normal because it was added later.
A doubled die is a hub event. A working die received two or more impressions from the working hub. If the die shifted between impressions, every raised design element on the hub appeared doubled on the finished die. Coins struck from that die show doubling on letters, digits, portraits, or other design features that came from the hub.
An RPM is a punch event. The doubling is limited to the mint mark letter, because that letter was punched into the die separately by hand. The rest of the design on the coin looks normal, because the hub impressions were clean and the doubling came only from the mint mark punch.
A coin can carry both types of variety at once. The 1943-D over D Lincoln cent, for example, is listed as an RPM and shows doubling on the D. A hypothetical coin could show a doubled bust from hub doubling plus a doubled D from a punch misalignment. The two events are cataloged separately in variety guides.
Well-known RPMs collectors watch for
Several RPMs have earned their own price entries in variety guides and grading service listings. These are the ones a general searcher is most likely to see mentioned or offered.
| Coin and date | Variety type | What makes it notable |
|---|---|---|
| 1938-D over S Buffalo nickel | Over mint mark (OMM), a close cousin of RPM | The 1938-D over S is the first repunched mint mark of any United States coin recognized by collectors. Dies originally intended for San Francisco were repunched with a D and used at Denver. |
| 1943-D over D Lincoln steel cent | Repunched mint mark on the wartime zinc-coated steel one-year issue | A widely listed RPM on the one-year steel cent, catalogued in the standard variety references and often sought by wartime cent collectors. |
| Wartime Jefferson nickels, 1942 to 1945 | Large above-Monticello mint mark, fertile ground for RPMs | The wartime nickel used an unusually large mint mark above Monticello. That larger punch magnifies any misalignment, so multiple RPMs are cataloged across the P, D, and S wartime issues. |
| Buffalo nickel D and S issues, 1913 to 1938 | Hand-punched D and S at the working die stage | The full Buffalo nickel series is a rich RPM hunting ground, because every branch mint coin had the mint mark added by hand. Multiple dates carry cataloged D over D and S over S varieties. |
| Lincoln cents, 1909 to 1989 | Hand-punched D and S at the working die stage | The most cataloged US series for RPMs. Every branch-mint Lincoln cent from 1909 through the late 1980s was hand mint-marked, and hundreds of RPM listings exist across the run. |
Sources: Wikipedia Buffalo nickel entry citing Bowers on the 1938-D over S; Wikipedia Jefferson nickel entry on the large above-Monticello wartime mint mark; Wexler's Coins and Die Varieties site on the pre-1990 to 1991 hand-punched mint mark process. Checked August 2026.
Values on these listings vary widely. A weak RPM on a common date may add only a few dollars. A bold RPM on a wartime nickel or a Buffalo nickel branch issue can command a strong premium in higher grades, especially once certified by a third-party service.
How to spot an RPM under 10x magnification
An RPM lives entirely at the mint mark. That narrows the search area to a single small letter, usually under the date on the obverse or below the reverse design, depending on the series. A loupe of 10x magnification and a strong, angled light source are enough for most examinations.
Tilt the coin under the light and look at the mint mark from several angles. On a genuine RPM you should see two fully formed impressions of the same letter. Both should be raised the same amount above the field, with a small flat gap or clean line where they meet or overlap. Serifs on both impressions should be rounded and complete, not smeared.
Compare the mint mark to the rest of the design. If the mint mark is the only area with any doubling, and the letters and portrait around it look sharp and normal, an RPM becomes the leading candidate. If the whole side shows doubling, the coin is likely a doubled die or a strike doubling case, not an RPM.
Cross-check against a reference photograph. Variety sites and grading service pages publish images of each cataloged RPM by date, mint, and Wexler number. A candidate coin whose mint mark shape matches a published RPM at exactly the right position and angle is a strong match. A coin that does not match any listed variety is usually a look-alike.
Wexler numbers and how attribution works
RPM attribution is what turns a coin with a doubled mint mark into a listed variety with a market price. The primary published system is the Wexler RPM catalog, hosted at doubleddie.com. Each recognized variety receives a code such as 1960-D 1c RPM-001 that pins down the date, denomination, and specific misalignment pattern.
The main Lincoln cent RPM attribution set is maintained by John Wexler and Kevin Flynn, with additional Lincoln cent varieties tracked on Coppercoins by Charles Daughtrey. Buffalo, Jefferson, and other series RPMs are cataloged in the same reference tradition. Third-party grading services generally recognize these attribution numbers on their labels for well-established varieties.
Attribution matters because a bold RPM at one date can be scarce and valuable, while an almost identical looking mark at another date may be a weak, common listing. Dealers and auction houses price by attribution number, not by a general RPM description. A raw coin that a seller calls an RPM without naming the number and the reference source is a signal to slow down.
Grading services also recognize a limited set of headline RPMs on their standard labels. Others are attributed only when the submitter requests it and pays a variety attribution fee. That structure means the top RPMs carry a printed cross-check on the holder, while lesser varieties may or may not appear on the label even when the coin is certified.
What drives the premium on an RPM
The premium an RPM carries above a common coin of the same date and mint depends on four independent factors. All four matter, and a weakness in any one of them pulls the price back toward the common coin.
Strength of the doubling. A bold, clearly separated pair of letters commands more than a subtle secondary ridge visible only under magnification. Reference photos usually rank the strength, and dealers pay by that rank.
The underlying date and mint. An RPM on a scarce key date piggybacks on the base premium of the host coin. An RPM on a very common date, even a bold one, still carries the low ceiling of the common coin plus a variety premium.
Grade and surfaces. The same rules that price any coin apply. Original, uncleaned surfaces in higher grades trade at multiples of worn or cleaned examples. On copper cents the color designation of Brown, Red-Brown, or Red also matters.
Certification and attribution. A coin certified by a recognized third-party grader with the RPM number printed on the label commands a documented market price. A raw coin sold as an RPM without attribution trades at a discount, because the next buyer has to shoulder the authentication risk.
Look-alikes: machine doubling, die gouges, plating flaws
Most coins brought in as suspected RPMs turn out to be something else. Three common look-alikes account for the majority of misidentifications.
Machine doubling. A die that bounces or slides at the moment of strike leaves a flat, shelf-like ridge next to letters and digits, including the mint mark. Machine doubling can appear on any coin from any year. It adds no numismatic premium. On close inspection, the ridge is lower than the primary letter and looks smeared rather than engraved.
Die gouges and scratches. A stray mark on the die transfers to every coin the die strikes as a raised line or blob. Near a mint mark, a small gouge can imitate a secondary letter shape. The tell is that the mark does not follow the outline of the mint mark punch. A real RPM shows two complete letters, not a partial arc or straight line.
Plating flaws and grease-filled dies. On zinc cents from 1982 onward, thin or bubbled plating can distort the mint mark area. On any coin, a grease-filled die can leave the mint mark soft or partially missing, which is sometimes mistaken for a second impression. Neither event is a die variety, and neither carries the premium of a listed RPM.
The clean sorting rule is this. If the second image is raised the same amount as the first, with clean edges and complete letter shape, treat the coin as an RPM candidate and go check the attribution. If the second image is flat, smeared, partial, or off the mint mark punch outline, the coin is a common look-alike.
A worked identification walkthrough
Counterfeits and altered mint marks
Because RPMs live at a single small letter, they are one of the easier varieties for a bad actor to fake. Two patterns account for most fraud attempts, and both can be screened at the same time as the RPM check itself.
The first pattern is the mechanically added second impression. A common date coin has a shallow secondary letter carved, stamped, or engraved next to the real mint mark to imitate an RPM. Tool marks, pushed field metal, or a secondary letter with sharp cut edges rather than rounded punch edges give the alteration away under 10x magnification.
The second pattern is the added mint mark on a Philadelphia coin. A no-mint-mark cent, nickel, or dime has a fake D or S applied to imitate a branch-mint issue, sometimes with a second faint impression to imitate an RPM at the same time. The tell is usually the shape of the applied letter compared to a known-genuine mint mark of the correct year, plus tool marks around the base.
The safest defense against both patterns is third-party certification for any RPM offered at a real premium. Grading fees are small relative to the price gap between a common coin and an attributed RPM in higher grade, so the math almost always favors certification before funds move.
When third-party grading is worth the fee
Not every RPM belongs in a graded holder. The economics decide it.
For weak or very common RPMs on ordinary dates, the grading fee often exceeds the variety premium. In that case the coin lives in a flip or album at the collector level, and certification adds cost without adding value.
For bold RPMs on scarce dates the case flips. The same logic applies to high-grade RPMs where a single grade point moves the price several tiers, and to any RPM offered at a premium above a modest threshold. In each of those cases, third-party certification with a variety attribution on the label pays for itself in resale flexibility and buyer confidence.
The rule most experienced dealers use is simple. If the certified value is far above the raw value, certify. If the certified value is close to the raw value, save the fee. On RPMs, the split tends to fall along date scarcity and doubling strength rather than around any single dollar figure.
What your coin is probably not
Most coins pulled from a jar and identified by a family member as a repunched mint mark turn out to be something else. Knowing the common outcomes protects both the coin and the wallet.
A machine doubling case. The mint mark shows a flat ridge next to it because the die bounced at the strike, not because the punch was struck twice. Very common on any year and any denomination. Adds no numismatic premium.
A modern coin with a doubled mint mark. Any US coin dated 1991 or later on non-cent denominations, or 1990 or later on cents, cannot be a classic hand-punched RPM. Modern doubling on the mint mark is a different, generally lower-premium variety.
A die scratch or gouge near the mint mark. A raised line or blob next to the D or S that does not match the outline of a second letter is a die defect, not a repunched punch. Usually adds a small novelty premium at most.
An altered coin. A common date with a fake secondary letter carved or stamped next to the real mint mark. Tool marks and pushed field metal give the alteration away under a loupe.
A common date with a listed but weak RPM. The mint mark really is doubled and really is cataloged, but the doubling is minor and the host coin is common. The premium is a few dollars over a normal example, not a life-changing find.
A grease-filled die or plating flaw. A mint mark that looks fat, smeared, or partly missing because of a mint-caused strike defect, not because of a repunched die. Usually worth face value or close to it.
A cleaned or polished coin. Any brightening treatment on a suspected RPM drops the eventual grade to a details designation. On a bold RPM the absolute-dollar loss can be severe, and the surface change often obscures the very doubling that was to be attributed.
A cataloged RPM on a scarce date, in real condition, in real hands. This outcome does happen, and it is the reason to run the identification steps on every candidate. It is rare enough that no financial decision should ride on it until an independent grader has confirmed both the variety and the grade.
Repunched mint mark FAQ
How much is a repunched mint mark worth?
It depends on the coin date, the specific RPM number, the strength of the doubling, and the grade. Most listed RPMs add a small premium of a few dollars to a few tens of dollars over a common example of the same date. A bold RPM on a scarce date or in high certified grade can command a strong premium.
Very few RPMs reach the four-figure range in any grade, and only a small number reach five figures at the top of the grading scale. Attribution and third-party certification drive the actual selling price on any coin offered above the low-premium range.
What is the difference between a repunched mint mark and a doubled die?
A repunched mint mark is caused by a hand punch struck twice off register into a finished working die. Only the mint mark letter is doubled. The rest of the coin looks normal.
A doubled die is caused by a working die that received two or more misaligned impressions from the working hub. The doubling appears on design elements from the hub, such as letters in the legend, digits in the date, or parts of the portrait. The mint mark on a doubled die is often normal, because it was added later by a separate hand punch.
Can a modern coin be a repunched mint mark?
Classic hand-punched RPMs cannot occur on cents dated 1990 or later, or on other US denominations dated 1991 or later. From those dates the Mint began placing the mint mark on the master die, so no separate hand-punching step remained on the working die.
Modern coins can still show mint mark doubling from single-squeeze hubbing effects, misplaced mint marks, or mint mark gouges. Those are cataloged as different varieties, generally at lower premiums than the older hand-punched RPMs.
How do I tell a real RPM from machine doubling?
Under 10x magnification, a real RPM shows two fully formed impressions of the mint mark letter, each raised the same amount above the field, with clean gaps or lines between them. Both letters have rounded, complete serifs.
Machine doubling shows a flat, shelf-like ridge next to the letter, lower than the primary image and often looking smeared. It appears because the die bounced during the strike rather than because the die itself was doubled. It adds no numismatic premium.
What is the first repunched mint mark ever recognized on a US coin?
The 1938-D over S Buffalo nickel is cited as the first repunched mint mark of any United States coin to be recognized by collectors. It was created when Buffalo nickel dies originally intended for the San Francisco Mint were repunched with a D and used at the Denver Mint. Standard references trace the variety to research reported by Q. David Bowers among others.
Where do I look for the mint mark on a US coin?
Placement varies by series and era. On most twentieth-century coins the mint mark sits under the date on the obverse or below the main design on the reverse. Buffalo nickels carry the D or S under FIVE CENTS on the reverse. Wartime Jefferson nickels have a large mint mark above Monticello on the reverse. Lincoln cents show the D or S under the date on the obverse. Consult a mint mark placement guide before ruling any date in or out.
How are RPMs cataloged and priced?
The main published attribution system is the Wexler RPM catalog at doubleddie.com, with additional Lincoln cent listings on Coppercoins. Each recognized variety carries a code such as RPM-001 for a given date and denomination. Third-party grading services print the attribution on the label for well-established varieties. Dealers and auction houses price by attribution number, not by generic RPM description.
Should I clean a coin before checking for an RPM?
No. Cleaning can obscure the fine detail that attribution depends on and drops the eventual grade to a details designation. On copper cents the market discount for cleaning is typically 40 percent to 70 percent of the value of an original example. Preserve the coin exactly as found and let a professional grader work with the original surfaces.
Sources
- Wexler's Coins and Die Varieties, John Wexler. The Making of the Dies. Primary reference for the die-making process that produced classic RPMs, for the transition of mint marks from hand-punched working dies to master dies in 1990 and 1991, and for the further move of mint marks to the master design after 1994. doubleddie.com/58201.html. Checked August 2026.
- Wikipedia, Doubled die. Reference for hub doubling as a die-manufacturing event, the Wexler eight-class doubled die system, and the transition of the United States Mint to single-squeeze hubbing after 1996. en.wikipedia.org/wiki/Doubled_die. Checked August 2026.
- Wikipedia, Buffalo nickel. Reference for the 1938-D over S variety, cited as the first repunched mint mark of any United States coin recognized by collectors, with the Bowers account of Denver dies originally intended for San Francisco being repunched with a D. Also confirms Buffalo nickel specifications of 5.000 grams, 21.21 mm diameter, plain edge, and 75 percent copper, 25 percent nickel composition. en.wikipedia.org/wiki/Buffalo_nickel. Checked August 2026.
- Wikipedia, Jefferson nickel. Reference for the mid-1942 to 1945 wartime composition of 56 percent copper, 35 percent silver, and 9 percent manganese, and for the large above-Monticello mint mark used on wartime nickels including the first appearance of a P mint mark on a United States coin. Also confirms the 1938 Jefferson S mint marks that were overpunched with a D at Denver. en.wikipedia.org/wiki/Jefferson_nickel. Checked August 2026.
- Wikipedia, Lincoln cent. Reference for the introduction of the Lincoln cent in 1909, the mint mark placement under the date on the obverse, and the composition history that frames the run of RPM listings across the series through 1989. en.wikipedia.org/wiki/Lincoln_cent. Checked August 2026.
- United States Mint, Coin History and Artistry. Reference for the history of United States coin designs, the role of the Philadelphia Mint, and the general framework of United States coinage that hosts the RPM variety population. usmint.gov/learn/history-and-artistry. Checked August 2026.
- Coppercoins, Charles Daughtrey. Attribution reference for Lincoln cent die varieties including many cataloged repunched mint marks by date and mint. coppercoins.com. Checked August 2026.