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] Unable to continue production of hunting guns, Bunji Hamada founded The Japanese Gun Manufacturing Company (日本銃器株式会社, Nippon Juki Kabushiki Gaisha) and began production of the Hamada type pistol.^[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.^[5] The pistol was designed as a copy of the Browning Model 1910 and chambered for the 7.65mm Browning,^[6] as small caliber American and European pistols were popular among Japanese officers.^[1] Around five prototypes for the Hamada pistol were tested by the Chief of the Ordnance Bureau before approval for adoption was made in 1941.^[7]

The Hamada pistol does not carry the tradition naming of Type 1 (一式, Isshiki) for Japanese calendar year 2601 similar as the Type 94 Nambu pistol or Type 26 revolver despite being officially adopted.^[1] The majority of Hamada pistols were sent with the Imperial Japanese Army to China with a few units transferred to the South Pacific.^[3] All production records were destroyed during World War II by bombing raids on Japan.^[3] It is estimated that between 4,500 and 5,000 pistols were manufactured before production ended in February 1944.^[6]

The Hamada pistol is a blowback pistol and functionally a copy of the Browning Model 1910.^[2] The most significant design difference between the Hamada pistol and Browning Model 1910 is the replacement of the interrupter lugs used to hold the barrel of the Browning Model 1910 with a dovetail joint.^[2] The frame plate lock design and striker assembly were also modified and awarded patents in 1943.^[7] The Hamada pistol maintained high quality throughout its production, with the bluing done to a high standard.^[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.^[9]

Eight variations of known Hamada pistols exist with slight differences between them^[1] with all known pistols containing serial numbers between 2,214 and 2,959.^[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.^[3] The number of serration made on the rear slide increased from six to seven between variation one and two, being reduced back to six serrations with variation three.^[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.^[8] The serial on the grip of the pistol was enlarged between variation four and five.^[8] The slide identification markings were discontinued between variation five and six^[8] with the slide muzzle crown being simplified between models six and seven.^[10] The disassembly arrows stamped on the slide and frame that, when aligned, allowed the slide to be removed were adjusted to indicate a slight change in design.^[10]

Holsters supplied with the Hamada type pistol were usually made of cowhide leather and contained black metal closure fasteners.^[11] Because the Hamada pistol has a long, nine cartridge magazine, the holster of similar weapons like the Browning Model 1910 will not properly contain the Hamada pistol.^[11]

• Derby, Harry L.; Brown, James D. (2003). Japanese Military Cartridge Handguns 1893–1945. Atglen, Philadelphia: Schiffer Publishing. ISBN 0-7643-1780-6.
• Hogg, Ian; Weeks, John (2000). Military Small Arms of the 20th Century (7th ed.). Iola, Wisconsin: Krause Publications. ISBN 0-87341-824-7.
• Hogg, Ian; Walter, John (2004). Pistols of the World (4th ed.). Iola, Wisconsin: Krause Publications. ISBN 0-87349-460-1.

• Forgotten Weapons: Japanese 7.65mm Hamada Pistol on YouTube
• Forgotten Weapons: Japanese 8mm Hamada Type 2 Pistol on YouTube