For 4.5” barrage rocket. Designated by the navy as Mk137. 2.965” long, brass and steel. About 42,000 manufactured by Caltech for the navy in 1943. Prototype for several later fuzes. “A”: cutaway model with 10-vane propeller. “B”: standard model with 8-vane propeller, cutaway. “C”: Model 2, 10-vane propeller; minor alterations over the original model were made by the Bureau of Ordnance (Buord).
AIR-7 (Mk148) fuze
For 3.5" and 5.0" aircraft rockets. 2.96" long. Steel and brass. Modification of AIR-2 (Mk137) fuze, designed to be used in combination with a base fuze. Could be used safe (unarmed) or armed at the pilot's discretion. About 5,000 fuzes were manufactured and loaded for the navy by Caltech and delivered late in 1943. Also 25,000 sets of parts were made for assembly with parts from AIR-2 (Mk137). "A": cutaway version with cap (shipping guard); "B": has cap and adapter to accommodate different thread arrangement for fuze seat liner of the 5.0" rocket.
Unidentified early fuze (1943) and plastic model, tagged “Reject.”
“A”: about 3.75” long, steel and brass, with cone-shaped cap; “B”: (model) about 2.5” long, steel, brass and clear plastic.