I, too, was rather impressed by what they made, given what I imagined they had to start and work withThat is by far the best native-made lock from SEA I've ever seen, and the only bridled lock, though the tumbler does not have an internal trunnion. This is just more evidence of the workmanship of the maker - the barrel even has a hooked breech! FWIW, the lock and sideplate are probably made from available sheet steel, though they could have been made from knife blades. The trigger guard is much nicer looking than the usual strip of sheet brass or steel. Note, however, the use of ordinary hardware screws for the lock - good use of available materials. I bow to a mechanic.
mhb - MIke