This is a beautiful example of a very early all blued, three digit serial number Harrington & Richardson, Reising Model 50 submachine gun. It is a blow-back operated SMG that was used for a short time by the USMC in WWII as a war expedient substitute for the Thompson submachine gun. The big advantage was they were faster and much cheaper to produced as well as shorter and lighter. Approximately 100,000 produced through WWII. The receiver is marked "MODEL 50- H.&R. REISING-CAL. 45/HARRINGTON AND RICHARDSON ARMS CO./WORCHESTER, MASS. U.S.A. PAT. PENDING", with serial number "688" towards the rear of the receiver. The right side of the receiver has the three position (SAFE/S.A./F.A.) selector switch and it is fitted with a stamped sheet metal adjustable rear sight with blade front sight. The barrel has the cooling fins in the middle like the early and the muzzle is fitted with a unique compensator/muzzle break. It is fitted with a one-piece walnut stock. The cocking lever is found on the underside of the forend. This lot comes with one original Reising Model 50 20 round magazine.