I picked this one up a few months ago. Dates to late 1983 by the serial number. The pickup locations are different than the 22 fret "pickguard" models. I've only seen one other 20 fretter and that was a red one with a maple neck. This one has the matching headstock. I imagine not many were made.
20 Fret Pilot
22 Fret Pilot (note pickup placement)
20 Fret Pilot
22 Fret Pilot (note pickup placement)