The M1 SMG was introduced in April 1942 and was a simplified wartime version of the original M1928 Thompson Submachine Gun. These wartime models exhibit manufacturing shortcuts, developed to facilitate a cheaper/easier way to manufacture SMG, with a higher production rate, while still having a high reliability. These features are: a simple stamped "L" type fixed rear sight, horizontal walnut forearm, fixed butt stock and side-mounted cocking handle, with no cooling fins on the barrel and no compensator. Additionally the entire bolt mechanism was redesigned for faster production that includes a one-piece forged bolt with a simple firing pin mechanism. The receiver is marked "THOMPSON SUBMACHINE GUN/CALIBER 45 M1/NO. 85120", and the right side is marked "AUTO ORDNANCE CORPORATION/BRIDGEPORT CONNECTICUT U.S.A.". The left front edge of the receiver is stamped with the Rochester Ordnance district inspector initials "R.L.B." with a circled "GES", and a single "P" proof on top of the barrel. The lower trigger housing is marked "AUTO/SINGLE" and "FIRE/SAFE", with the serial number "85120" stamped on the underside of the trigger guard. This SMG is complete with two 30-round magazines. This is the exact type of SMG that was used for many years by Vic Morrow in the hit TV show "COMBAT". As noted this very rare example does have matching numbers on the receiver and lower trigger group. This SMG was DEWATED by welding a plug inside the barrel/chamber area along with a small tack weld at the junction of the barrel and the receiver face.