Incuse marks on a coin are 99% of the time, damage to the coin. Only 1% of the incuse marks are a mint error. People mess with coins so much and vending machines damage coins a lot. It is just a tough life being a coin in circulation.
Almost thought that it was a DDO for a second but then immediately realized it's just circulation flattening on the date. I happen to own a 1972-D 1DO-001 so it kind of looked like that one.
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