Just picked this one up a couple of weekends ago. GX-F95 from 1981. From what I can see popping the top and looking at the innards, it appears to be the next gen version of the 760, adding LED meters, auto calibration for bias and level and some computerized memory and programming features I'll probably never use. Vintagecassette.com cites the model as having Dolby B and C, but either that's an error or there was a mid-model revision, because this unit only has B.
This is the newest cassette deck and the newest Akai model of anything I've ever owned (previously had two 70's Akai R-R decks), so no idea what came after this one.