via this auction, also on Reverb
"What we have here is a museum find. This is David van koeverings #1 Proto type synthesizer one of a kind. From a collection owned by David. Moog super salesmen responsible for the launch and success of the minimoog. In great condition comes in Viking case. I plugged the orchestron in it powers up but I have no discs to test it..."via Wikipedia: "Vako Synthesizers Incorporated, founded by electronic instrument pioneer and former Moog technician and salesperson David Van Koevering, started to build improved versions of the Optigan under the name Orchestron in 1975. Intended for professional use as an alternative to the Mellotron (hence the name Orchestron), it featured improved recorded sounds over the Optigan. The Optigan was an organ that played its sounds from light scanned graphic waveforms encoded on film discs. The sounds with the highest fidelity were on the outer rings of these discs. These outer rings were used for the Orchestron sounds to improve the sound. Although the Model A Orchestron is identical to the Optigan, the models B, C, and D follow the designs of the Chilton Talentmaker. The Talentmaker was taken out of the market after Optigan's manufacturer – Optigan corporation, a subsidiary of toy company Mattel – threatened to sue Chilton because of patent infringements..."
