A product of the 1960s, the Model 137 was the earliest variation of the Gyrojet Pistols, using a solid fuel rocket in place of a standard cartridge. Only around 150 of the Model 137 were made, with this example being 121 and gold plated. Since the rocket projectile does not need a solid chamber or extractor equipment, the entire pistol can be greatly simplified and made from lightweight materials. Features fixed blade front and fixed notch rear sights, front-mounted hammer, "PAT. APPLIED FOR/MODEL 137 CAL. 49" marked on the left side, and integral checkered grips. Includes original cardboard box, 12 fired rockets, and original MBAssociates paperwork pertaining to the Model 137.