I have a 1954 D nickel. It has doubling on the mint mark. But is this also doubling on "states of america"? As well as the end of the building by mint mark? Can anyone tell me if this is a known error coin?
. Going to need close ups of areas in question. As of now it looks like MD=machine doubling not a doubled die.A doubled mint mark is called a RPM,and I can not tell anything about the mint mark with these photos. John1
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