This is an outstanding example of a World War II U.S. contract Winchester Model 12 Trench Gun. The shotgun has the high polish Winchester blue finish on the receiver, barrel and four hole hand guard/bayonet lug. The walnut stock and grooved slide handle are oil finished. The black hard rubber buttplate is checkered and has the Winchester trademark in a circle in the center. The right side of the receiver is roll-stamped with "U.S." followed by the Ordnance "Shell and Flame" insignia below the ejection port. A "Shell and Flame" Ordnance proofmark is stamped on the top of the barrel just in front of the receiver. The left side of the stock is stamped with the ordnance final inspection marks "G.H.D." in a rectangle with a small Ordnance Corps crossed cannons escutcheon immediately below it. The oval Winchester proof is stamped on the top of the receiver and on the top of the barrel immediately behind the Ordnance proof. The left side of the barrel is roll-stamped with the standard markings, model designation and bore above "CYL". The factory markings are partially covered by the hand guard. The serial number is located on the underside of the receiver and the magazine tube. Winchester Model 12 Trench Guns were used extensively by the Marine Corps in the Pacific Theater during World War II. The World War II production Model 12 Trench Guns remained in the military inventory until the 1990s, most of the Trench Guns saw considerable service and many were arsenal overhauled. Original examples of Winchester Model 12 Trench Guns in excellent or better condition are very scarce. Includes a full 25-count World War II era box of Winchester brass shell 00 buckshot 12 gauge ammunition, a Winchester Model 12 Trench Gun instruction pamphlet, and a tan canvas Atlas Awning 1943 dated U.S. shotgun ammunition pouch.