Interesting. I've seen G330S models on e-Bay, about the same vintage (1983, by the serial number,) made in Japan, with the "lawsuit" headstocks. Apparently there was a move toward today's "G" series just before Takamine changed its headstock design. Your guitar looks like a 12-string G-series version of the F-385 they made then. I'll bet there aren't very many of them.
That's also about the time Takamine was selling a small line of solidbody electrics, a couple of which had headstocks much like today's design. Sort of a crossroads period in the company's marketing philosophy, I'd say. Soon after that things seemed to gel: no more solidbodies, new headstock, G-series production to Korea, focus on acoustic/electric design, laser-cut inlay.
Your guitar looks pretty fresh for its age. You'd better get after it if you're going to wear it out!
C140SH; GX-200T; F-400S; EF340S BG; four "partscasters" (honorary Taks.)
Some amps. Pick collector extraordinaire