Button found at 200 year old house? what is it from?

[treasurechris]

I was detecting north nashville,tn at a house built in the late 1700's. This house was used by confederate soldiers. I found this button and was wondering how old it might be and if it came from a soldier? I have seen a few like it but none exactly. It is the size of a nickel and has standard color treble gilt on it in brass it looks like. Can someone tell me some history or when it dates back. Thanks

 

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