Produced in limited quantities, the Grandpa Nambu was the introductory model of the Nambu Pistol, so nicknamed for being 2 generations ahead from the WWII standard Type 14 Nambu. This example appears to have been altered to be closer in configuration to the Papa Nambu, particularly by deleting the stock slot from the back strap. Produced by the Tokyo Gas and Electric Company under Navy contract, with the "GTE" marking on the chamber, an anchor proof on the right side of the frame next to the model markings and serial number and a pair of Kanji markings on the left side. Fitted with fixed front and tangent rear sights, serrated/knurled cocking knob, grip safety on the front strap, lanyard swivel, checkered contoured grips with red and white paint markings on the right panel and a nickel magazine with checkered aluminum base. Matching numbers are present on the bolt and cocking knob.

Fine, with 70% of the arsenal refurbished blue finish, showing scattered light pitting, areas of brown patina and mild handling marks. An arsenal installed flush-ground insert is visible on the back strap where the stock slot has been filled. Grips are also fine, with a few mild dents and dings. Mechanically very good.