ORIGINAL: ScottBSA
I am often, make that almost always wrong, but I'll play.
It's a harness buckle. There was a strap with holes in it that passed through the slit, went around a ring and caught the pin in one of the holes. Take that answer!
Beat me what it really is.
Scott
ORIGINAL: mtfdfire22
Why would you not want to bring it home?????? I always take that stuff. Someday you will see one in an antique shop and say "HEY, I got one of those!" I keep all the lids, marbles, pipes, compacts, dolls, and other "whatzit's" I find.