Forerunner of the Type 14 Nambu that would be the standard Japanese sidearm of World War Two, 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, straw finished small parts, smooth back strap, and nickel finished magazine with alloy base, and an extra magazine. Mixed numbers are present on the firing pin spring guide and both magazines, otherwise all visible numbers are matching. Also included with the group is the Russo-Japanese War variant of the Japanese Medal of Honor.

Fine, with 70% of the original blue finish, showing mild pitting on the grip straps and light spotting elsewhere, along with mild edge wear and handling marks. The small parts retain about 40% of the original straw color, with a mixed gray patina on the remainder. The grips are also fine, with some dings and flat spots on the otherwise crisp checkering. Mechanically excellent.