Brass mystery from Union camp

[Ripcon]

This brass bar came from a Union camp in west central Mississippi. It is 3 inches long and as you can see if has 4 "teeth" spaced down one side of the bar. I'm included 2 pictures. One of these pictures shows as brass "tack" looking projection where maybe it was driven into wood or leather?? Any help or quess? Thanks.

 

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[Tony in SC]

Cinch for a strap or belt either leather or canvas.

 

[Ripcon]

Thanks Tony in SC!

 

[Tpmetal]

tony nailed it