![]() A large number of circulating examples firat appeared in Phoenix, Arizona according to researcher Walter Breen. The error was discovered early and first reported by Kingston, NY collector Arnold Cohn in the March, 1943 issue of the Numismatic Scrapbook Magazine. The well known Philadelphia example and a less dramatic overdate produced at the Denver Mint. The error occured twice, as two varieties have been discovered. The foot of the "4" is also strongly doubled as a result. Apparently, a 1941 working die was struck after the annealing process by a 1942 hub which created the overdate. Between strikes the dies must be annealed in order to harden the steel. The process involved requires at least two impressions to accomplish. Production dies are impressed using working hubs which leave an incuse impression of the coin's design on the die. It was during this process that the dramatic overdate error occured. At the same time dies were being struck for the new 1942 dated coins. Though near the end of the production run for 1941 Mercury dimes at the Philadelphia Mint, working dies were still being produced. It's probably the most well known overdate of any American series. ![]() The dramatic 1942 over 1941 Mercury Dime overdate is nearly as well known as the 1955 double die Lincoln Cent. ![]()
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