Type 14 brought home in large quantities by returning GIs. Brian Murphy's gunshop in Tucson recently had two Type 14's in nice condition priced from $400 to $450. It is estimated that approximately 272,000 or so Nambus were produced at the Nagoya and Kokura arsenals, so they're not uncommon.
Kijiro Nambu was the designer of the Nambu pistols. He was a General in the Imperial Japanese Army, and developed the Type 38 Heavy Machine Gun and Type 11 Light Machine Gun. In 1904, he developed the first model of the Nambu pistol. Though it was not introduced into the IJA, the Nambu pistol was produced by a private enterprise and it was introduced by IJN in 1915.
In 1925, IJA also introduced the improved model of Nambu pistol as the Type 14 Pistol which was almost the same as the early model except some small improvements. About 279,000 Type 14s were produced. Later production models were fitted with a much larger trigger housing to fit the hand of a shooter wearing gloves.
Nambu pistols were used by officers and MPs of the IJA until Japan's surrender.