I think I can just make out the Liege Belgium tower proof mark on the left hand barrel, just forward of the lock. There should be more proof marks on the underside of the breech area. It's a Belgian made, export quality, double gun. If the barrels are in good condition, it most certainly could be used. It all depends on how pitted/dented/bulged they are. Have the barrels evaluated by someone experienced with antique double guns before trying to fire it.