Strange Button ID Please

[pistol-pete]

Dug this button in 1880's mining camp yesterday. Could some one please help with ID?? It's 5/8" dia. copper and seems to have a self attached rivet on the back. Thanks in advance

 

[Breezie]

Hey PP, I'm not the button person, but since it is copper and has a self rivet back, I would think it would go into leather or denim (overalls.) Neat find Breezie

 

[Bryanhashemi]

I was thinking it would go into leather also breezie

 

[Breezie]

I was thinking it would go into leather also breezie

What about a holster rivet? Breezie

 

[Bryanhashemi]

are my eyes playing tricks on me?? is it concave or convex?

 

[pistol-pete]

Concave

 

[Bryanhashemi]

still going with some kind of leather rivet. Not terribly old in my opinion.