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I think I found another one - Improperly annealed 2020 D Marsh Billings quarter
Kurisu
Posts: 1,849 ✭✭✭✭✭
Coins are Neato!
"If it's a penny for your thoughts and you put in your two cents worth, then someone...somewhere...is making a penny." - Steven Wright
3
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Looks that way.
Dip it in acetone.... could be residues.... Cheers, RickO