I found this buckle in an area I've found a three-ring bullet and some tent grommets. The buckle was 8" deep or so. I washed it off, and the edges of the center of the buckle look like copper or brass (which is what my detector said for target ID, too). Where most buckles have a tongue that can move, this one is a fixed post. Some of the guys in my club thought it might be from a saddle or harness, but nobody has seen one quite like it. Does anyone here know what it is?