This picture just brought back a lost memeory. My Dad died when I was 13 about 35 years ago. I remember him having a pistol just like this. I new nothing about guns but I knew the "spiral" on the back and the Japanese symbols on the slide. Thanks for posting.
"Original series" Japanese Type 14 Nambu. Manufactured by Nambu Rifle Manufacturing Company/Chuo Kogyo Production at Kokubunji under Nagoya Arsenal supervision. Dated June, 1937.