i also have an Oklahoma State Quarter with similar markings, on the back side, it looks like it was stamped more than once, like 3 times, and it shows through to the front side, where do I post pics of it to get more info on it? it came from the bank in a quarter roll and was given to me by my mother
From that pic it looks simply like a stain to me. Only other thing that would look like that that I can think of would be some sort of lamination defect, but I really don't think thats the case here.
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