Don't worry firearms are attractive to us but the question is not one I can help with, in regard to the barrel. The numbers are industrial stamps, applied individually without the care a skilled gunsmith would usually use. Note the overturned W used as M, reduces the number of stamps needed in a set. The numeral style is at earliest 19th to early 20th century in my opinion, and the look of the superscript m to my mind is French.
This would be consistent with arms registration in the 20th century, when police or tradesmen not artisan gunsmiths apply the numbers. Perhaps Algerie Francaise registered all weapons.
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