Help identifying button. Military?

[A&O]

Can someone help identify this button? I can find similar examples, but can’t find a match. There are 21 stars.

 

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[HIGHSTRUNG]

Any pics of the back?

 

[A&O]

Unfortunately no back was found.

 

[Steve in PA]

That is a federal staff officers button. That style was is use during and after the Civil War.

 

[A&O]

Thank you.

 

[Digger RJ]

Nice!!! Congrats!!!

 

[crossfire631]

Nice find! That button is in really nice condition!

 

[A2coins]

Awesome find and ID

 

[Professor of Engineering]

Very nice find, congrats!