What is it?

[Walt82]

I found this small copper disc this evening and I have no idea what it is . One side is flat the other side is convexed, it has a small hole in the edge that's not very deep. I found it along side some shotgun shells and a rimfire rifle cartridge.

 

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[Obsessive]

snap cover? Pics of the back might help.

 

[DCMatt]

Apothecary weight? Although, they are typically marked with the weight and/or some official stamp...

 

[Walt82]

 

[Walt82]

Its solid on the back , I took another picture

 

[Subterranean]

Pendulum weight for a smaller clock?