Well what in the mint process could cause this? If it were pre-strike, the devices would have erased the alteration of the coin? It is on top of the coin. 3.05 grams is not far away from 3.11 grams
Coop, I believe the die was tooled to be removed from service and inadvertently put into use. But that is just a theory. The 1974 Aluminum cent was never supposed to leave the mint, I think this cent was as well.
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