This one came up for auction in March 2012 and went through a number of successive listings without selling. The final asking price was $1,699, which doesn't seem to be out of line for an early 1969 bass in exceptionally clean condition.
"Break out your bell-bottoms and warm-up the VW bus with all of the psychedelic painting on it . . . this is a NO RESERVE AUCTION for a vintage and rare 1969 Ampeg Dan Armstrong "See-Through" plexiglass bass! Reminiscent of the late '60s, this bass occupies a special place in rock 'n roll history.The serial number on the neck is D301A which makes this an early 1969 bass. Based on the serial number, out of approximately 3000 Dan Armstrong basses made, this was the 201st bass made. (This statement is based on the information available from the website "Dan Armstrong: The Man and His Guitars".There’s a little history on these basses below, but first let me describe this particular bass. The most unique feature is the striking clear plexiglass body, which is unique in the history of bass guitars. It also has a Maple neck, a Rosewood fretboard, and Schaller tuners. Bill Lawrence helped design the pickup.The bass is in very good to excellent condition. Everything is working on the bass . . . . the pickup, pots, bridge and tuners all work just as they should. The neck is straight with just a bit of relief in it. The fretboard is in excellent condition and there is very little fret wear. There are some light scratches on the body, but no large scratches, dings, dents or chips. Overall, it is in great shape for a 42 year old bass.The sale includes the bass and a nice Levy’s gig bag."