Japanese 10 or 11 monme heavy teppo / matchlock with bronze barrel, mid 19th century, smooth, round, 19 mm / .74 in bore, stamp at the base, rectangular rear sight, octagonal, enlarged muzzle with foresight; bronze pan, brass lock with iron hammer; wooden stock with bronze mounts, length 108.5 cm / 42.7in, 9kg / 19.8lb.