Large Type 88 Instantaneous (Gun and Howitzer-Mortar) impact type artillery fuze.
Upon firing, the arming collar drops and the wedges are pushed out by centrifugal force, clearing the path for the striker.
Above are some rounds this fuze can be found on. (Left-to-Right):
• 70mm Type 3 H.E.A.T. (Howitzer)
• 57mm H.E. for the Type 90/97 Tank Gun
• 47mm x 284 H.E. for the Type 1 Anti-Tank
or Type 1/97 Tank
Here are two different marking schemes for this fuze.
At left are three Kanji symbols
This fuze was used on antitank, tank, field artillery and howitzer ammunition.
81mm mortar rounds (i.e. Type 100) often appear with this fuze attached.
U.S. TM9-1985-5 indicates this fuze was made in two types, with differences in the strength of the internal latch spring safety
inside, but outwardly identical. A strong spring version for gun use and a weaker spring (less set-back force required) for howitzer use. It would
seem, if this were true, there would be markings on the fuze to identify the types.
Date code & Arsenal Markings.
Showa 18.8 (Aug1943)
Fuze bodies were also made of blackened steel.