copper disc with etching on it

[treasurefinder315]

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

 

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[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