Comparing: T95E6 vs. STB-1

Some military analysts deemed the experimental tanks of the T95 series to be undergunned. In order to increase the tank's firepower, a new, heavier turret, designated T96, was to be mounted on the hull. This would allow replacement of the 105-mm gun with a 120-mm gun. However, development proved unsuccessful, and the project was canceled on July 7th, 1960. Only one dummy vehicle was built.

In the early 1960s, Mitsubishi started development of a new tank that complied with government requirements for armament and defense. The first two prototypes of the STB-1 were manufactured in September 1969 for trials. In 1970 the prototypes were shown to journalists and participated in a military parade.