What is this Civil War era relic?

[GeauxLSU]

I found this while searching an area FULL of Civil War relics. I've never seen it before and am still a little new to detecting so I'm stumped as to what it could be. The first pic shows it "closed" and the second pic shows it open. Any ideas?

 

[Charlie P. (NY)]

Looks like part of a reversable belt buckle (brown leather on one side and black on the other). If so - not CW era.

 

[HomeGuardDan]

Not sure - but the construction looks post civil war to me. The rivets are more common with early 20th century construction.