Manufactured in 1848 and this revolver falls into the reported 2,001 to 3,000 serial number range for the Walker Replacement Dragoons first identified by researcher John J. Fluck in 1956. Estimates for the total production of these revolvers are as low as 300 but the total is likely closer to 1,000. They are also known as "pre-First Model Dragoons" or "Second Contract Dragoons" and were designed to replace Walker revolvers that failed while in use by the U.S. military using original Walker parts and reworked parts. The revolver has the distinctive First Model style oval cylinder stops and brass square back trigger guard. The top of the barrel flat is marked "ADDRESS SAMl COLT NEW-YORK CITY" reading from the breech to the muzzle. The left side of the frame is marked "COLT'S/PATENT/U.S.". The cylinder is roll engraved with the Indian and Rangers battle scene and "MODEL U.S.M.R./COLT'S PATENT". There is a small "P" stamped on the top of the back strap cylinder directly ahead of the serial number and on the upper left side of the barrel. The complete matching serial number is marked on the barrel, frame, cylinder, trigger guard and back strap. The loading lever, wedge and cylinder pin are un-numbered. Blade front and hammer notch rear sights. The frame was casehardened, the grip frame silver plated and the remaining metal surfaces were blue. Fitted with a smooth one-piece walnut grip.