This one came up on eBay in February 2012. The original auction reached $787 but the buyer flaked. The bass was then re-listed and finally sold for $640 in March.
"Here's a nice and tidy 1970 Ampeg Dan Armstrong Lucite "Plexi" Bass. This is the real deal as used by Bill Wyman and countless others. It has replaced tuners and the cavities painted black (possibly original). There is some playing wear and light scratches on the front that could be buffed out and there are a couple on the back that are a little deeper to go with some belt buckle rash. It has a regular phillips head screw instead of a thumb wheel for the pickup and an added washer for the jack plate. The serial number is D1465A and the pots are from the 33rd week of 1970. Rumor has it that this one was actually owned by Dan himself, although I have no proof of it.The neck is nicely played in and feels like an old friend. It is nice and straight and measures 1.65" at the nut to go with a 30" scale length. The frets are in nice shape and the action is low. The previous owner painted a couple of the side markers in white. Sure looks like a Brazilian Rosewood fretboard to my eyes...This is a deep sounding bass that is also nice and percussive. I have it set up with a set of Vintage Gibson Thunder Bass Strings that really work on this baby. It ships in the case shown, which is an Ampeg reissue case in like new condition."