This is an original 1971 Moog Musonics Sonic 5 synthesizer. There were only 100 of these wooden Sonic Vs made; this is #18 of that 100.
(It is the rare predecessor to the Sonic 6, which was made from 1972 on. )
It is in good working shape but could use some cleaning of switches and key contacts. it has a crazy range of modulation options, making it more like a modular synthesizer than the Minimoog. Look on YouTube for great demonstrations of how experimental and wild this instrument can get. I would not ship a vintage instrument like this, I want to show it to you in person, so local pick up only, and cash please. If you don't live in the LA area, you likely have a friend here who can come test it and take it to ship to you, if you like...