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A well known example of a small mint mark is 1945-S "Micro S" U.S. Mercury dime, when the mint used an old puncheon intended for Philippines coins. [14] A much rarer example is the 1892-O "Micro O" U.S. Barber half dollar , which may have come about from the brief use of a mintmark puncheon intended for the quarter. [ 15 ]
Doubled die coins are mainly created by a defective hub which is used to create many dies for the minting process. Collectors classify doubled dies as DDO (doubled die obverse coins), DDR (doubled die reverse) and OMM (over mint mark). The over mint mark is created when a one date and mint mark is punched over another date, part of a date, or ...
You don’t usually see errors with proof coins, but there are exceptions. One involved 1975 dime proof sets, which that lacked an “S” mintmark (from the San Francisco Mint).
6. 1982 and 1983 Roosevelt Dimes, No Mint Mark Some dimes from 1982 and 1983 were minted without a mint mark, and these varieties can be of interest to collectors.
Some of the rarest and most valuable coins in U.S. history owe their worth to minting errors that slipped through unnoticed. Coins like the 1943 Copper Penny, struck in copper instead of wartime ...
The 1955 dimes from the three facilities are the lowest mintages by date and mint mark among circulating coins in the series, but are not rare, as collectors stored them away in rolls of 50. [28] With the Coinage Act of 1965, the Mint transitioned to striking clad coins, made from a sandwich of copper nickel around a core of pure copper.
According to PCGS (Professional Coin Grading Service) price guide editor Jaime Hernandez, only about 150,000 Roosevelt dimes were released in Philadelphia in 1982 without a mint mark.
In an initial attempt to improve the quality of the pieces, the Mint made slight modifications to the designs, though both the old (Type I) and new (Type II) were struck in 1958 and 1959. One obvious difference between the types is the number of long tail feathers on the eagle—Type I half dollars have four tail feathers, Type II only three.