CLASSES of DOUBLED DIE COINS

Doubled die coins occur when the die itself receives multiple design impressions from a master hub with a slight misalignment, not during the striking of the coin itself. Numismatists classify these mint errors into eight distinct classes based on how the misalignment occurs:

• Class I (Rotated Hub): The hub rotates slightly around the center axis of the die between impressions, causing doubling that curves outward from the center.

The 1955 Lincoln Cent Doubled Die (Class I) is the most famous and dramatic doubled die error in U.S. numismatics. Caused by a rotated hub during die manufacturing at the Philadelphia Mint, it features unmistakable doubling on the date, “LIBERTY,” and “IN GOD WE TRUST”.

• Class II (Distorted Hub): The die expands or changes slightly between hubbings (often due to heat treating), causing the design to spread outward toward the rim or inward toward the center.

The 1970-S Lincoln Cent Doubled Die (Class II) is an extremely rare and highly valuable error coin. The most famous and dramatic variety (officially classified as FS-101) features an inward Class II spread towards the center, creating clear overlapping details on the obverse.

• Class III (Design Hub): A die meant for one design or denomination is accidentally hubbed with a hub bearing a completely different design.

The 1960-D Lincoln cent “Class III Doubled Die” is better known as the famous Small Date over Large Date variety. This minting error occurred when the Denver Mint used working dies featuring the “Large Date” design, but re-hubbed them using hubs with the “Small Date” design.

• Class IV (Offset Hub): The hub shifts in a straight, offset direction (e.g., entirely north or south) without rotation.

The 1984 Lincoln cent doubled die (officially classified as a Class IV offset hub doubling) is a famous error coin where the design was accidentally impressed into the die twice. Minted in Philadelphia, it is universally known as the “Double Ear” variety.

• Class V (Pivoted Hub): The hub tilts or pivots on an axis, creating doubling that increases the further it gets from the pivot point.

The 1995 Lincoln cent doubled die obverse (often classified as FS-101 or WDDO-001) is a famous and dramatic Class V pivoted hub doubling error. Because the hub pivoted close to the date, doubling is most prominent on “LIBERTY” and “IN GOD WE TRUST,” while the date shows almost no visible spread.

• Class VI (Distended Hub): The hub’s dimensions are slightly larger than the previous impression (due to wear or metal flow), resulting in expanded and thickened lettering.

The 1943 Lincoln cent doubled die Class VI (specifically known as Distended Hub Doubling) is one of the most famous and sought-after steel cent errors. It is celebrated as the strongest Class VI doubled die in the entire Lincoln cent series.

• Class VII (Modified Hub): Features on the hub are manually altered, ground down, or changed between impressions, creating a modified doubled design.

The 1963-D Lincoln Cent “Doubled Die” is a well-known error coin. While the query refers to a Class VII (tilted hub) variety, the prominent variety for this year is a combination of hubbing methods including Class VIII (tilted die) or rotational hubbing. It is officially recognized as FS-101 (DDO-001).

• Class VIII (Tilted Hub): The die or hub is tilted during a squeeze, resulting in uneven, tilted doubling across the surface of the coin.

The 1972 Lincoln Cent Doubled Die Obverse (DDO) #8 (classified as FS-108 in the Cherrypickers’ Guide or WDDO-008) is a recognized variety featuring Class VIII (Tapered Hub) doubling. Unlike the highly dramatic “FS-101” variety where the doubling is visible to the naked eye, DDO #8 shows strong clockwise rotation with a smaller spread.

The U.S. Mint still occasionally produces true doubled die (DDO/DDR) coins. However, modernized manufacturing has made dramatic errors extremely rare.

How They Used to Happen
Traditionally, a “hub” was pressed into a die multiple times to transfer the coin design. If the hub or die shifted slightly between presses, it created a doubled image on the die itself, meaning every coin struck by that die would have a distinct doubling.

Why They Are Rare Today
The U.S. Mint transitioned to highly precise computerized equipment and a “single-squeeze” hubbing process in 1996. This was designed specifically to eliminate die misalignment. However, modern doubled die coins still happen—primarily in the Lincoln cent series—because the extreme mechanical pressure used in a single squeeze can cause the die to rotate slightly during the process.

Spotting Real vs. Fake Doubling
Many collectors mistake true doubled dies with common, lower-value mint flaws.

• True Doubled Die: Occurs during die creation. Letters are distinctly separated, raised, and rounded with notching on the corners.
• Machine Doubling: Occurs when a coin is struck. The die vibrates or shifts upon impact, creating flat, shelf-like, or smeared edges rather than distinct separation.

To learn more about authentic modern varieties, you can compare suspect coins against verified examples using resources like the Professional Coin Grading Service Variety Index.