Hi John, welcome to the forum!
As you could probably guess, your guitar is a very special piece. I won't dare to speculate on it's history or provenance, but I'd guess it to be in low or single digits as far as serial#s go, and at that time there were maybe one or two players looking for a small-bodied, light-weight model to get them through a long night of jamming. Your photo is worth a thousand words~ I've seen other peanut guitars before, yet the simplicity of the electronics on yours deduce the whole peanut concept to it's lowest common denominator!!!!