button from santa fe trail

[dano91]

Just wanted to know if someone might help me identify this button.
dug on Santa Fe trail about a foot deep, found with several other items from the 1800's
Thanks Dano.

 

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[Montana Jim]

At first I thought curtin weight, but the second picture makes it a two piece button... with no markings I don't know.

But someone may be able to help... good luck!