Yonezawa Toys (known also as Yone or simply Y) was one of Japan's largest and most prodigious postwar toy manufacturers and an early participant in the growing radio control market.
The company was founded in the 1950s in Tokyo and focused on the production of literally thousands of different electrrically operated and mechanical toys through the early 1970s. Some were branded not as Yonezawa but as STS. It is unclear as to the origin of the STS label, but it is presumed to be that of an importer.
Yonezawa briefly dabbled in radio control in the mid-1980s with the introduction of the 1/10-scale Wave Hunter buggy, sold in North America as the Monogram Lightning.
It is unclear what has become of the company, but it is believed to be involved in the production of industrial electronics.