
The M404, M404A1, M404A2 fuzes are of the base detonating (BD), direct arming (arming pin), impact fired (inertia plunger), non delay type. They are used in 3.5 inch rockets.
No information about functioning.
Nothing else to see.
TM 9-1385-51, Ammunition (Conventional) for Explosive Ordnance Disposal (1967)