Japanese Baby Nambu, 7mm, Tokyo Arsenal Logo on the chamber. This has the early Prototype features to include the convex cocking knob, the curved magazine release surface, larger rear frame vent, and firing pin retainer machining difference. Other minor differences are included as well. The matching numbered magazine, has a matching internal number on the aluminum base. This has all matching numbers, about 95% blue and a VG+ shiny bore. The book, Japanese Military Cartridge Handguns 1893-1945, by Derby & Brown state that only 16, of the 447, possible serial number range were reported at the time of printing. A rarely encountered pistol, suitable for even the most advanced collector.