Mitsubishi did not make a lot of models but those few released to the market are of different colors. So, it is easy to disginguish blue MH700 model from bright pink MH350, and emerald green MH-20 from yellowsih MH-16.
To the best of my knowldge, all Mitsubishi knitting machines are standard-gauge.
Mitsubishi MH-10
Mitsubishi MH-15, manual/basic, with needle selector
Mitsubishi MH-16, manual/basic, with needle selector
Mitsubishi MH-20, manual/basic, with needle selector
Mitsubishi MH-350, manual/basic
Mitsubishi Color 7 MH-700, pushbuttons