Importation of foreign sidearms ceased in Japan in 1941, increasing the need for domestic production, and fully nationalizing all raw materials available for gun manufacturing.

[1] Initially, the Hamada Type I was designed as an inexpensive and more reliable alternative to the standard issue Nambu pistol, which had a bad reputation among the Japanese military.

[8] The safety, rear frame plate, and extractor were heat tempered to a reddish brown and the barrel, striker, and firing mechanism were brightly polished.

[3] The narrowness of the range may be attributed to the small number of pistol assigned to the Pacific Theater, where U.S. soldiers collected souvenirs.

[8] The grip made of walnut and had a checked pattern with the border design, and lanyard loop being simplified between pistol variation three and four.

[10] Holsters supplied with the Hamada type pistol were usually made of cowhide leather and contained black metal closure fasteners.