Certainly have it looked at if you wish, but it is glue or some foreign substance and another coin was stuck to it at some point.
I agree, someone ground it down, nothing at the mint could make it look like that.
"Happy's" had a small display case of coins, mostly Mercury dimes, Washington quarters, Wheat and Indian cents, maybe a Barber or two. If I went...
Yup, that is about it. If there are more than a few people there is no room to move.
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