Manufactured in 1879 as a "overrun" revolver. As defined by Kopec and Fenn, "overruns" were "the result of a purposeful overproduction of military component parts, which were manufactured to assure a consistent supply of usable parts in quantities which would satisfy the then-current military contract." Unused U.S. Ordnance sub-inspected components were assembled by Colt and sold on the civilian market. It has a Henry Nettleton inspected frame that lacks "US" marking as commonly found on "overruns." The top of the barrel has the one-line Hartford address, the frame has the three-line patent dates marking, and the trigger guard is marked "45 CAL." Belgian "star/R" proofs are stamped on the barrel, frame and cylinder along with a Liege proof on the cylinder. The left side of the grip is stamped "D 15" followed by a grouping of three stamped circles. Matching serial numbers are on the frame, trigger guard, back strap, cylinder, and barrel. The accompanying factory letter confirms the .45 caliber chambering and blue finish. As typical the barrel length and type of stocks are not listed, usually an indication of a 7 1/2 inch barrel and walnut stocks. The revolver was part of a 50 unit shipment dated December 17, 1880 and delivered to Colt's New York Office in New York City. Includes a Burgess & Co. U.S. leather flap holster.