Datsun 15 Roadster
From Nissan press:
1936 Datsun 15 Roadster: This roadster had the same 722cc engine as the "14", but by increasing the compression ratio from 5.2 to 5.4, maximum horsepower was increased by 1ps to 16. As with the phaeton, it was distinguished by the square badge on the radiator grille and louvers on the side of the hood that look as if they open and close. Due to changes in the law, from the "15" onwards, the spare tire could be mounted on the outside of the trunk.