8mm Nambu caliber, 3 3/4″ barrel.  Finished blue with black checkered composite grips.   Nagoya arsenal marked with the Showa 18.6 (June 1943).   These were mfg. from 1935-1945 with a limited production of 71,000 units.  I excellent original condition retaining nearly all of the arsenal blue, mint grips and bore.  Matching magazine.  This is one of the best condition examples I have ever seen.