Developed in 1942, the U.S. M1 Thompson was a streamlined version of the classic Thompson SMG, intended to simplify the weapon and speed the manufacturing process. While frills were trimmed, the M1 was still a classic "heavy metal" SMG, constructed from machined steel with fine hardwood furniture. Blade front and fixed peep rear sights, with a straight forearm under the smooth barrel, "FJA" and "GEC" inspection marks on the frame along with the address markings and model nomenclature, ribbed pistol grip and a fixed buttstock. The original serial number "167903" is present on the receiver and trigger guard, with the registration number "IRS 3407" on the left side of the receiver. The bolt is the simplified M1 design, with the Blish lock eliminated and the cocking knob moved to the side, but still retaining the articulated firing pin. A number of accessories are included, with a black leatherette transport case, two extra stick magazines in a leather belt pouch, a Seymore "L" type 50-round drum magazine, two canvas magazine pouches (1 for stick, 1 for drum), a canvas SMG case, a hardwood display stand and assorted periodicals with articles on the Thompson.