Celebrating the 30th anniversary of MSX, ASCII Corporation Japan published several articles on the MSX computer. One of these interesting reads lists the 3 rarest MSX computers according to ASCII. Did you know the 
General Paxon PCT-50, which was built into a TV set and therefore king of screen shots, or the 
Mitsubishi ML-T2SH, which was targeted at the telecommunication and stock trading needs of the 1980s businessman and came with a phone hand set. Perhaps you did, indeed, but how about the 
Oyama Industry MX-2021 which was created specifically for factory automation?
Relevant link: 
ASCII lists the 3 rarest MSX machines