This one was spotted and sent in via swissdoc. It appears to be a one off SSM based DIY synth built sometime between 1981 and 1986. You'll find some info and demos on Technology Trendline here. I believe this is the first time it has been featured here on MATRIXSYNTH.
"This keyboard was the manual from a Conn electric organ recovered from a fire and found in the rafters of a pipe and reed organ manufacturer in Hicksville, NY. The keyboard scanner is built from discreet logic producing a monophonic last-note-played algorithm. The circuits were all hand-wired on prototype boards. The sound-producing technology is primarily based on a suite of chips manufactured by Solid State Micro Technology (SSMT)."
