The pic of the lock is not clear enough to tell if it is native made or production. Even if it is production large quantities of these locks were sold in the area into the 20th century. The piece is pretty much run of the mill. If it were my piece I would pull the barrel pour a few inches of water into and push a long rod with a worm or screw on it into it to remove any shot or ball and powder. Afterwards I would pour oil into it and soak the barrell and lock for a couple of weeks. Clean off all active rust and then wax the pieces. After the oil soak the lock will almost always unfreeze there are only 2 screws holding it in on the other side.
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