A co-worker brought me this to ID. Found on an old farm.
Riveted two-piece tool that opens to 90 degrees, and closes square. Length of 5 3/4". One side has a 5/8" opening and the other has a tab 5/8" in length.
Looks like a crimper of some kind to me, but for large gauge. No hammer marks on it.
The tool has most of what looks like original japanning to me.
I find no numbers or maker marks on it anywhere.