A closed-bolt blowback-operated sub-machine gun, the Reising Model 50 saw action with the United States Marines in the Pacific as a substitute for the M1 Thompson, though they found their best success as defensive weapons for war-essential industries and as patrol carbines for American police forces. Blade front and elevation adjustable peep rear sights, with a flash hider/muzzle break, cooling fins on the barrel, three-line New Haven address near the ejector port, and three position selector on the right side. Smooth pistol grip stock, with cocking lever on the underside, a ribbed buttplate and "CITY OF PITTSBURGH" stamped on the left side of the buttstock. With a "FBI" style case, spare rear sight components and four extra magazines. Though no documentation is available on the Pittsburgh stamp, Federal Laboratories (a major distributor of both the Reising SMG and cases identical to the one in this lot) was based in that city and Reisings so marked have been attributed to the Pittsburgh Police Department. Also includes a fabric/leather case.