you take a piece of thin metal place over the half dollar or any coind then lay it face down into a 2x4 wood and go SMACK from behind ! it leaves a inpression and you use the metal with the impression for junk jewlrey like belt buckles,jackets flea market crap ,
that one is a obvious reject that didnt turn out so well and prob thrown away.
The clue was the popper sound , you said it pops in and out . Thats what those impression metals do.
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