UNITED STATES Mod.1873 Springfield Trap-door Rifle socket bayonet, triangular blade

UNITED STATES Mod.1873 Springfield Trap-door Rifle socket bayonet, 450 mm triangular blade, locking ring, 535 mm oalength. Originally depp blue-black finish but no original finish remains, but little sign of rust, face to bayonet clearly Stamped U.S., at riccasso face, overall good to very good condition. No scabbard, but scabbard without bayonets do turn up. 76 mm socket, 18.2 mm muzzle diametre.