Model 97 (1937) Hand Grenade
One of the most widely used grenades of the Pacific War and was caried by all Japanese front line troops. It was nearly identical to the Model 91, except it had no provision for a base propelant attachment and had a shorter fuze delay time.

Many American reports from the later stages of the Guadalcanal campaign report dud gernades being used against them that failed to explode. The brutal environment of the island took its told on the Japanese munitions. Or, conversely, the fuze was also known to sometimes be erratic.