How much do they weigh? Are they silver?
A long period in a clothes dryer or a rock tumbler will do this to a coin. Here's an earlier thread. Notice how the rim flattens and the details wear off. It's hard to fake this.
http://goccf.com/t/115336I've seen similar rim-raising when people hammer coins to make rings. But the central coin features stay intact.
"Two minutes ago I would have sold my chances for a tired dime." Fred Astaire
Edited by thq
01/14/2019 11:29 am