PMD, looks like someone took a socket, put it on the coin and hit it with a hammer. Probably why you don't see the damage on the reverse could be it was placed on a piece of leather before it was hit with a hammer. That's just a guess.
Either way it is PSD. Nothing in the striking process could alter a coin like that. (I'm leaning more towards the machine shop lathe theory. the socket theory would have made a pushed out area on the reverse of the coin)
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