Comparing: STB-1 vs. Object 430

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.

A prototype of this medium tank was developed from 1953 through 1957 to replace the T-54. Soviet authorities wanted a tank with greater nuclear survivability and firepower, so in 1961 the project was discontinued in favor of the Object 432. Several prototypes of the vehicle were manufactured.