Hello
Generally, the numbers on the pieces of a weapon, are to identify the worker / craftsman responsible for the completion of the piece, or is filed to the correct dimensions, or to empardar pieces of a cock.
About the origin of the barrel, I can not venture anything, except that it seems European. What strikes me is that the breech screw (breech) seems to have a non-usual shape, by the lines that you see in the barrel, above and at the level of the ear Affectionately
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