Manufactured in 1957, the first year of production for the Buntline Special revolver. Colt manufactured approximately 3,900 of these Buntline Specials from 1957 to 1975. Standard one line address on top of the barrel and "COLT BUNTLINE SPECIAL .45" on the left side. The bottom of the barrel is marked with the stock number "BB598" just ahead of the cylinder pin. Two line, three patent date marking on the left side of the frame followed by the Rampant Colt. The matching serial number is marked on the bottom of the frame and on the left side of the grip straps under the grips. The matching assembly number "517" is marked on the right side rear of the frame and on the loading gate. Standard blade front and frame notch rear sights, casehardened frame, blue on the remaining parts and fitted with smooth two-piece walnut grips. Complete with the original black hinged lid box numbered to the gun. In the box is the manual, Colt warranty card and "Handling the Handgun" brochure.