The Third Model Dragoon can be quickly distinguished by its round trigger guard and was the most widely used of Colt's massive "horse pistols" that began with the famous Colt Walker. Around 10,500 Third Models were manufactured between 1851 to 1861. Many of these were used in the Old West and during the Civil War. This U.S. martially inspected Third Model Dragoon was manufactured in 1851. Production of Third Dragoon revolvers commenced at approximately serial number 10700; this is an earlier example of a Third Dragoon revolver that was part of the Ordnance contract for 2,000 revolvers issued on May 8th, 1851. "COLT'S/PATENT/U.S." marked on the left of the frame. The barrel has a nickel-silver front sight blade and is roll-stamped "-ADDRESS SAML COLT NEW YORK CITY-" in one line facing the cylinder. The cylinder has the standard Indian fight scene with U.S.M.R. and Colt's patent markings. Matching full and partial serial number "13064" marked on the frame, trigger guard, back strap, arbor pin and handwritten in black ink inside the grip mortise. "12619" marked on the replacement cylinder. Matching full and partial serial number "12418" marked on the replacement barrel, loading lever and wedge. Single letter inspection initials on various components, and "JH" (James Hawkins) inspection initials on the left flat of the barrel. Very faint bordered script inspection cartouches stamped on either side of the grip.