There's an article with the early history, including the model Stevie Ray Vaughan played:
www.flyingvintage.com/gcmag/srv.html
AFAIK the models sold in the UK were affected differently by the Fender lawsuit, eg the headstock remained the same shape here. The headstock logo on the earliest ones had Fender-style writing and the 'T' was shaped like the Fender 'F' ie '7okai'. After Fender complained these were changed to block capitals 'TOKAI', then an elaborate scripted logo and finally back to the Fender-style writing, except with a normally shaped 'T'.
I picked up one of the final logo models (3-tone sunburst & maple neck) along with a 2x12 for GBP150 about 10 years ago. A mate has a 'TOKAI' that sounded better (more bass) until I replaced my pups with Dave White 'Old Glory's, now they sound similar (his has a rosewood fboard). The Tokais on
www.wizardguitars.com seem overpriced - I've seen second hand models in shops for GBP200-300.