above photo from the collection of Joseph Rivers, Audio Playground, Orlando, FL
This is Moog's response to ARP's Pro-Soloist. It was a preset monophonic synthesizer with one VCO. Many where built into Organs (see Cordovox) by the Thomas Organ Company, who also agreed to manufacture and sell 5000 stand-alone units for Moog (at a royalty of $75 apiece). It featured one thin-sounding VCO and VCF. Presets included brass, reeds, strings, bell, and lunar.
[from The A-Z of Analogue Synthesizers, by Peter Forrest, published by Susurreal Publishing, Devon, England, copyright 1994 Peter Forrest]