copper disc with etching on it

[treasurefinder315]

I meant to add this picture with the dime to show size comparison

 

[Breezie]

First of all, WELCOME to the forum! What you have looks like the back of a pocket watch, or it could be the top to a compact. Can you post a pic of the other side? if so, we can see if it is threaded like a pocket watch or had a clasp like a compact lid.Interesting find, Breezie