Collecting vintage Japanese guitars is a hobby, my favorites are Greco but I also have Fernandes, Hohner, Tokai, and Epiphone guitars.
Here are some links to vintage Japanese guitar website.
Probably the best vintage Japanese guitar catalog source ever
Facebook group dedicated to vintage Greco guitars
Fernandes catalogs and other cool stuff
A side topic to the Les Paul forum, lots of cool guitars
Facebook group all makes and models
If it's not an Ibanez built before 1976 it's not a true 'lawsuit' guitar
A HUGE list of 'badge' names used by Japanese guitar builders / factories