Japanese Type-14 Nambu Pistol
This is the Nambu Type-14 semi-automatic pistol. This pistol was produced from 1925 until 1945. This example has the digits 19.5 stamped into the frame. This is the year and month of manufacture. In this case you add 19 to 1925, the first year of the Showa Emperor. This gets you to 1944. May is the fifth month so the pistol was produced in May 1944. The manufacturer is Toriimatsu and this pistol is from the second series. 1944 was the high point in the manufacture of this pistol so the 19.5 is pretty common. These pistols a terribly ugly and have a bad reputation for shooting their owners. The ammunition, 8mm Nambu, is almost unobtainium.