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"KORG MS-20 Analog Semi-Modular Synthesizer. This is a classic patchable monophonic synth that made its debut in 1978.
The unit appears to be working well to the best of my knowledge, all the keys, knobs, and patches worked perfectly when I did a test accordingly to the owner's manual. I noticed a bit of noise on some of the knobs, probably could do with some simple cleaning/adjusting.

Cosmetically its in very nice condition as you can see from my pictures. There maybe some very light rust on the patch bay, and some minor surface marks on the back as shown in my picture #9, but otherwise everything is very clean and in great shape!
Overall in excellent condition if you consider its age, which is getting pretty rare for these models."