sorry to be so late to answer, a lot of work. Well, your gun supports belgian proof marks from belgium (Liege). The V crown was among the controlers marks in service between 1853 and 1877. So I think your shot gun was made by Jacques ROUX, barrel maker at Liege (Belgium) between 1856 and 1890. produced 620 barrels in 1856. Took belgian patents in august 1856 for a mecanism that enhanced the Lefaucheux locking mecanism. Three other patents in 1861 and 1865. The stock is of the french style for as much as I can see. if the diameter of the barrels is circa 18.2-18.5 mm, it is a 12 gage. If the diameter is circa 17.5 mm, it is a 16 gage. Last year, Fiocchi was still producing cartridges in these calibers.