Hi - found in North Central PA at a site where the oldest coin found was an 1864 IHP. The diameter is .728 and the length is .650. It is solid one piece construction, not pressed together like a rivet. Any ideas? Thanks!
Kind of like a cufflink, used in adjusting leather straps. Could be used for adjusting harness where there is no strain on the leather, like the straps that hold the britchin' in place. The only one I recall seeing was on a belt for humans, which folded over for adjustment on the buckle end. Don't know how well it worked. Seems like it would be common if it worked good. On harness and other leather there are copper rivets and burrs, and you can usually tell where the rivet is upset to hold the burr in place. There are also tubular rivets, but they don't look anything like your find.
Another method is that the leather had a keyed hole. A circle with a line cut along the lengthwise piece of the leather. The stud slips in and rests in the circle cut-out. The slits are placed where the leather isn't stressed from the pull.
I was thinking earlier along those lines Charlie, but you would think with two pieces of leather with that pattern cutout that they would lose rivets faster than they could replace them? Unless it was a snug fit. Thanks for the imput