while I was coin roll looking came across this coin someone with a lot time on his hands incased this coin in a copper and left no tool marks why who knows but I thought to post it for a hmm take a look
I know this doesn't help much but the reverse reminds me of a German euro coin, but without the stars on the edge.
From the front, it looks as though a person could just pop that thing right off. Someone was probably in the process of making a necklace.
Someone definitely had too much time on their hands. Damage, but still a cool find. Keep up the hunt!
