British, 18th century, 45 caliber, cannon shaped barrel with proof marks on underside, walnut stock with silver mount buttcap of a grotesque mask with marks for .925 fine, Birmingham, maker's mark, lock plate engraved "London" and "Joyner", trigger guard with floral etching, 5-1/4 in. barrel

dark patina, pitting and sctratching to steel, surface scratching and denting to silver mounts, marring to the wood surface, hammer and trigger work appropriately