Vestax had one as well, but I canīt remember the number, I think it was the rotary version of the Vestax PMC 40 (the predecessor of the PMC 46 MK1 and MK2) - it had the highs/lows in one potentiometer (inner and outer ring or so) and a rotary x-fader in the middle of the four channels.
The old Nakamichi stuff is great. I have not got to mess with the 610 yet however. I am not sure if it would be suited for DJ use because I am not sure how the cue system works. I would try to pick one up to find out (because I can't find out otherwise) but I have my hands full with 3 vintage rotary mixers. It looks like the center of the row of 5 1" knobs is a "blend" control. The thing is damn sexy. I have a Nak 600 tape deck in silver and it is beautiful and sounds wonderful. A 610 sold on ebay for super cheap recently. They are really rare.