1975 Minimoog Model D SN 6728

Note: Auction links are affiliate links for which the site may be compensated.

via this auction

"Here's the holy grail of Bass and Lead analog synths: a Moog Minimoog model D synthesizer. From the serial number, it was built in 1974/5, so it's 40 years old. It's had two owners, the last of whom has had it for 30 of those years.
It was serviced in November of 2014 by David Trouse of Cotati, California. He cleaned contacts and springs, and reported that all switches and controls function well. It has not had its oscillators replaced, so it has the original Moog sound. It isn't perfect - a couple of keys could ideally use new bushings, but are quite playable. As with all of these units, you have to tune the oscillators manually - and that's a big part of their unique sound. It comes with printed operation and service manuals."