Sorry to spam being a newb but I found a weird penny in a 1999 Proof set that is unopened and isn't cracked. It only affects the penny? Any ideas what happened? Thank you.
It could be the set has a crack on that area of the set. Or maybe the coin planchet was affected before the strike toning/staining the areas in question. Not a plus for the coin or the set. More of a distraction and lowers the value of the proof set.
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