I could be wrong, but I believe that the Micro-Matic is a Maganavox version of the "COLLARO CONQUEST" changer. There's info about it here:
http://mypage.iu.edu/~lrobins/collaro.htm They're supposed to be one of the best changers as I understand it, they automaticly detect record size and reject at a constant speed regardless of turntable speed. BTW, I have a AstroSonic console of similar vintage that I'd make someone a great deal on... it's currently in my dining room and has to go!