Small Mk 2 Base Detonating FuzeMedium Mk 1 Impact Base Fuze
Japanese Explosive Ordnance – Army Ammunition – Navy Ammunition
Chapter 4 – Section 4
ARMY PROJECTILE FUZES
Small Mk 1 Base Detonating Fuze
Use: Type 1 37-mm A.P. projectiles.
Description:

Over-all length (with gaine): 2 1/16 inches.

Maximum diameter: 1 3/32 inches.

Threaded length: 7/16 inch.

Number of threads: 7.

Construction: This fuze is identical to the small Mk 2 except for size.
Operation: The operation is the same as for the small Mk 2 fuze.

Figure 339 – Mk 1 Small Base-Detonating Fuze.

Small Mk 2 Base Detonating FuzeMedium Mk 1 Impact Base Fuze