MOST FAMOUS
1956 DDO FS-101 — Doubled Die Obverse
$20 – $1,100+
The 1956 DDO FS-101 is the single most celebrated variety in the entire Roosevelt dime series. It is a proof-only error that occurred during die preparation at the Philadelphia Mint: when the hub transferred the design to the working die, it made contact twice with a slight misalignment, impressing a second set of design elements fractionally offset from the first. The result is a raised, shelf-like doubling visible across the entire obverse face.
The doubling appears most dramatically on the letters of "LIBERTY" and "IN GOD WE TRUST," where each letter shows a pronounced secondary ridge just outside its primary outline. The date numerals carry a shadow-effect separation between the two impressions, and designer John R. Sinnock's "JS" initials below the neck truncation also show clear doubling. A 10× loupe is sufficient to confirm the variety; it is never subtle.
This variety is listed as CONECA DDO-002 and appears in the Cherry Picker's Guide to Rare Die Varieties, the definitive reference for Roosevelt dime collectors. It appears exclusively on proof specimens from Philadelphia—never on business strikes—which limits the collectable population significantly. In PF-64 condition, examples sell for $20–$400; at PF-69 the auction record stands at $1,100 (eBay, July 2019, per PCGS CoinFacts). Cameo and Deep Cameo examples command further premiums above those figures.
MOST VISUAL
1956 Clipped Planchet Error
$25 – $300+
A clipped planchet error occurs during the blanking stage of coin production, before any die work takes place. The continuous silver strip fed through the blanking press occasionally misfires, allowing the circular punch to overlap a hole already cut from a previous strike. The result is a planchet—and ultimately a finished coin—that is missing a curved crescent-shaped section along one edge, as if a bite were taken out of the rim.
On 1956 Roosevelt dimes, curved clips are most common, though straight clips (from the strip's leading or trailing edge) also occur. A genuine clip can be authenticated by the Blakesley Effect: the rim directly opposite the missing section shows a distinctive weak or missing rim area, caused by the lack of metal flow during striking where the void was present. This diagnostic feature separates genuine mint errors from post-mint damage.
Value scales directly with clip size. Clips removing 5–10% of the planchet are the most frequently encountered and bring $25–$50. Medium clips removing 15–20% of the coin command $75–$150, while dramatic clips affecting 20% or more have sold for several hundred dollars—one example reaching approximately $240 at Heritage Auctions in 2020 according to CoinKnow research. The coin's overall grade and the clarity of the Blakesley Effect both influence realized prices.
BEST KEPT SECRET
1956-D Repunched Mint Mark (RPM)
$10 – $150
Before 1990, U.S. Mint employees hand-punched the mint mark into each individual working die after the main design hub had already been impressed. This manual process involved striking a hardened steel punch bearing the letter "D" into the die's surface with a mallet. If the initial punch was weak, misaligned, or struck at a slight angle, the worker would strike the punch again—often at a fractionally different position—creating a repunched mint mark (RPM) that transferred to every coin struck from that die.
On 1956-D Roosevelt dimes, at least 17 distinct RPM varieties have been documented by CONECA and the coppercoins.com attribution system, ranging from barely visible tripling of serifs to dramatically spread secondary impressions. The strongest and most collectible is CONECA RPM-001 (FS-501A), which shows a very widely spread secondary "D" to the southwest of the primary mint mark. Under a 10× loupe it appears as two overlapping D shapes, offset and distinct. Additional notable varieties include RPM-003 (D/D North) and RPM-004 (D/D Northeast).
Minor RPMs add premiums of $10–$30 over standard 1956-D values in uncirculated condition. More dramatic examples with clearly separated secondary impressions—especially the FS-501A—bring $50–$150 depending on grade and clarity. Collectors should distinguish genuine RPMs, which show raised doubling of the letter, from mechanical doubling (also called machine doubling), which produces flat shelf-like distortion with no collector premium attached to it.
COLLECTOR FAVORITE
1956 Die Crack & Cud Errors
$15 – $200+
Die crack and cud errors result from the natural mechanical wear of the hardened steel dies used to strike coins. After many thousands of strikes, the tremendous pressure of each impact causes microscopic stress to accumulate in the die face. Eventually that stress manifests as a hairline crack running across the die surface. Because the die is harder than the planchet, the crack appears on every subsequent coin struck from that die as a raised line—the metal of the planchet flows up into the gap in the die.
Die cracks on 1956 Roosevelt dimes most commonly appear running through the letters of "LIBERTY," across Roosevelt's portrait from the collar to the rim, or through the torch and olive or oak branches on the reverse. As a die continues to be used past its optimal life, these cracks can widen and eventually cause a chunk of the die face to break free entirely. This produces a dramatic "cud" error: a raised, blank area on the coin's surface, typically at the rim where die stress is highest, where the broken die section left no design impression but the metal still flowed into the void.
Minor die cracks are the most common type of 1956 Roosevelt dime error found in circulation and command modest premiums of $15–$30 in uncirculated condition. Dramatic rim-to-rim cracks or spectacular cud errors showing large blank raised areas can bring $75–$200 or more depending on size and visual impact. The most dramatic examples—large cuds spanning multiple design elements—are considered significant die variety collectibles and are actively sought by error coin specialists.
RAREST TYPE
1956 Lamination Error
$20 – $150+
Lamination errors originate during the earliest stages of planchet preparation, before a coin ever sees a die. The 1956 Roosevelt dime was struck on planchets composed of 90% silver and 10% copper, produced by melting and alloying the two metals, rolling them into thin strips, and then blanking circular discs. Occasionally, foreign materials, microscopic gas bubbles, or impurities from the original melt became trapped within the alloy as it solidified, creating weak zones in the metal's internal structure.
When one of these contaminated planchets was struck with the full force of the coining press, the stress could cause the compromised layer to peel, crack, split, or separate. On finished coins this appears as a raised flap of metal that has partially or fully separated from the coin's surface, a missing chunk where a lamination has already peeled away, or a linear crack running along the surface that looks like a deep scratch but has raised or uneven edges. The key diagnostic difference from post-mint damage is that the edges of a genuine lamination are raised or jagged, not pushed down into the surface.
Lamination errors on 1956 silver dimes are among the rarest planchet-related errors in the series, as the silver-copper alloy used in 1946–1964 was relatively consistent. When they do appear, their value depends heavily on the size and visual drama of the affected area. Small surface laminations covering less than 10% of the coin typically bring $20–$40. Larger, more dramatic peeling laminations affecting a significant portion of the obverse or reverse can command $75–$150 or more, particularly when the peeling layer is still attached and creates a three-dimensional effect.
