What could this be?

[Dirt_Hunter]

Hey guys! Recently I was metal detecting near an old mill location. I discovered my first horseshoe... And this. I am assuming this is a button, can anyone help with the age? The material is copper.

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Cheers!

 

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[Stef45]

could be a suspender button or something like it

 

[SkaBa]

Looks like a snipped off copper rivet.

 

[Dirt_Hunter]

That could be it SkaBa...