Copper disc

[artyfacts]

Hello all. Dug this 1 inch copper disc today. It was badly folded. It is one inch wide by 1/32 of an inch thick. It is made of copper. It has a lot of backbone for a thin piece, Any ideas? Thanks, Arty

 

[Iron Patch]

Probably a button if there's no design on the back.

 

[relichunters]

Can you show a picture of the back?

 

[Dano Sverige]

Metal cap from the top of the cork from a champagne bottle? Indentations either side could be where the wire went to hold the cork in?