My father has had this in his coin collection for a while. It is the same size as a nickel. Is it a blank planchet?
Way back in 1968, my father got a roll of new dimes from the bank so he could look for mint defects. In the roll, he found a 1968 S dime, among...
you can tell it was a proof by the S as a mintmark those are only used in proof sets S mintmarks are for proofs '68 and later, except pennies...
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