Forerunner of the Type 14 Nambu that would be the standard Japanese sidearm of World War II, the Grandpa Nambu was produced in relatively limited quantities before the Papa Nambu was introduced. Blade front and tangent rear sights, with the "GTE" Tokyo Gas & Electric mark on the chamber, 3-symbol nomenclature on the right side, "naval anchor" on right rear side, straw finished small parts, smooth backstrap, checkered and nickel finished magazine with alloy base. Mixed numbers are present on the firing pin spring guide, with the magazine and grips restamped to match and the firing pin blank.

Very fine, with 75% plus original blue finish, with patches of pitting concentrated on the frontstrap and front sight, bright wear on the edges and the underside of the barrel, scattered spotting and mild handling marks. The grips are also very fine, with some minor dings and chips. Mechanically very good.