?This .31 caliber M1845 pistol was also known as the "Transition Pepperbox-revolver." This is a double action percussion revolver with a 2?" octagonal barrel without sights. Its overall length is 7?." It has a five-shot round cylinder bearing a roll engraved forest scene, including deer and ducks most of which is still pretty visible. The bar hammer is marked Patented April 16, 1845. The left side of the barrel reads, Allen & Wheelock Worcester, Mass US/Allen's Patent April 16, 1845 and the right side of the barrel retains the serial number "10xx." The serial # also appears on the cylinder. It has the standard trigger guard and correct, original ramrod. These were manufactured from 1858 into the early 1860s. Fewer than 1,500 were made, so this is a pretty scarce weapon. This one is in overall very fine condition, fully working with tight action. The black walnut "bag" grips are in excellent shape. An interesting, historical piece.