Dave Cornutt, at Sequence15, has an interesting post at his site about the mystery of the first Minimoog synthesizer.
Two synths appear to be contenders for the first Minimoog:
The Eboard Museum in Austria has a unit that they advertise as being S/N #1001. The Audities Foundation owns one that several third parties who have seen or used it claim is #1001 (the Foundation itself made no such claim, which should have been the first clue, but there was a confounding factor which I’ll get to in a moment).
Who’s got the first Minimoog?
Considering the fact that the Minimoog was probably the most influential synth in history, the first one should be worth a fortune.