I removed this bracket from a 1955 John Deere 40T tricycle tractor. I believe it is for a sickle bar mower. I don’t remember how or where it was attached, and unfortunately I don’t have any photos of it installed
The only part number I can see on here is Z1237H, on the two separate brackets on the corners. The U shaped central part has no visible part numbers.
Good condition, no cracks.