Baby Nambu ammo produced by the 1st Tokyo Arsenal.  A gorgeous full box of 50.   Very rare.  On the top is printed "Small Automatic Pistol - Loaded Ammunition - 50 Cartridges".  Date on the box is 19.7 (July, 1944), the latest date reported for these rounds. Single rounds sell for as much as $50.  An identical box sold at the Rock Island Auction for $3162.50.  I am pricing this one at $2500.