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 in 1851 to 1861. Only a select group of these with serial numbers over 18000 had the longer 8 inch barrels. The successor Model 1860 Army revolvers started out with 7-1/2 inch barrels and quickly changed over to 8 inch barrels. This revolver was manufactured in 1860 and has a German silver blade front sight, "ADDRESS SAML COLT NEW-YORK CITY" on the barrel, standard U.S.M.R. cylinder scene and patent markings, and matching serial numbers.