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Doubled die (also known as hub doubling) is a term in numismatics used to refer to a duplication of design elements on a working die created due to a misalignment of the die or hub during the hubbing process. Strength of the doubling can vary from very slight and isolated to extreme and widespread.
Coins minted using these dies cause coins to be minted with parts of the reverse design on the obverse or parts of the obverse on the reverse of the coin. Die rotations cause coins to be minted with the reverse or obverse of the coin partially or fully rotated. A die rotation occurs when the dies become loose and they then turn.
Two dies are used for striking a coin, one for the front — the obverse or “head’s” side — design of the coin and the other for the back — the reverse or “tail’s” side — of the ...
Double die mistakes occur when the metal on a coin gets struck multiple times by the die or design stamp on either the front (obverse), reverse, or both sides. Double die mistakes in mint or near ...
1969-S Lincoln Cent With a Doubled Die Obverse. ... Coin enthusiasts refer to this as a “double die reverse” coin since the stamping machine accidentally landed in a different spot, which ...
In this usage, obverse means the front face of the object and reverse means the back face. The obverse of a coin is commonly called heads, because it often depicts the head of a prominent person, and the reverse tails. In numismatics, the abbreviation obv. is used for obverse, [1] while ℞, [1])([2] and rev. [3] are used for reverse.
The marks seen above the word LIBERTY on this U.S. cent were caused by the obverse die clashing with elements on the reverse die intended to impress the space between the memorial columns in the design. A die clash occurs when the obverse and reverse dies are damaged upon striking each other without a planchet between them.
However, it too wears the dies when they are used for too long. An infamous example is the 1955 "poorman’s double die." This coin is sold as a replacement for the 1955 doubled die cent, but it is no more than Die Deterioration Doubling, caused by wear on the dies. When a coin is struck, the planchet is not heated. Although the planchet would ...