via this auction
"Sometimes named the Poly Ensemble or K-5 or even Poly Synthesizer (named so on the front page of the service manual). These synths were built from 1976 to 1979/80... very early model, this may be of little interest to a musician, but any collectors or synth historians will notice the naming used on presets 1 & 2 (‘Reed Wind #1 & #2’ rather than ‘Organ #1 & #2’ and the older style knobs (ie not MS-20 style knobs found on the later ones)...









































