Allen Standard Size, .31 cal. pepperbox.  Mfg. Worcester, Ma.  Good condition.   3 ½” barrels have goo d bores, Worcester address markings.  Patina finish.   Engraved nipple shield.   Frame has cast-in engraving.   Hammer is marked: “Allens Patent – 1845”.  Walnut grips are very good.  A very nice example!   Antique, can ship to your door.