A product of the 1960s, the Mark I Gyrojet uses a miniature solid fuel rocket in place of a standard cartridge. As the rocket does not need a solid chamber or extractor equipment, the entire pistol can be greatly simplified and made from lightweight materials. Fixed blade front and notch rear sights, "EXPERIMENTAL/MARK I" over the serial marked receiver, a magazine cover mounted on the left side, front-mounted hammer, and a pair of smooth grips. With a hardwood MBA display case, Robert Hutchings Goddard medallion, and ten dummy rounds of Gyrojet ammunition. This pistol along with a Gyrojet carbine with the same serial number, lot 588, were both originally shipped to a Dr. Robert D. Taylor. An included letter from MBA details the shipment of this pistol as well as Dr. Taylor's friendship with the heads of MBA. Also included is a certificate of authenticity issued to Dr. Taylor and stating this "is an experimental gun used in the research and development of the high-performance 13mm Gyrojet Rocket handgun" and an extensive collection of documents pertaining to the development of Gyrojet firearms including advertisements and correspondence relating to the pursuit of government contracts.