About Guyatone
Founded in 1933, Guyatone was one of the earliest Japanese "modern" music companies. They started as an offshoot of a cabinet-maker, manufacturing acoustic and Hawaiian guitars. By the late '30s, however, they were making Rickenbacker copies, inching their way into the brand new electric guitar business.
In 1951, the company started making amps and turntable cartridges, which proved very successful for business. They soon changed their name to Tokyo Sound Company in order to better reflect their many areas of business, but their guitars and amps kept the Guyatone name.
In the mid-'50s, they ramped up production of guitars and amps, riding a wave that would carry them even further into the future. In the '60s, they increased production again, opening up several more factories in Japan to keep up with demand. Something that set them apart from other Japanese guitar manufacturers at the time was the fact that they made all of their guitarsĀ and pickups in house until 1970, when a decline in sales forced them to start contracting work to other manufacturers.
Background info from TYM Guitars.