This bass came up on Ebay in August 2011 and sold for $980. There's no case, but otherwise the bass seems to be very original and intact, with the exception of some typical cracking and flaking on top of the pickup.
"You are bidding on a vintage used Ampeg Dan Armstrong Acrylic Electric Bass Guitar manufactured in 1969 as per its serial number, D928A. The bass is in exellent condition as seen in the pictures, especially considering its 42 years of age. The bass is all original and is fully functional, including truss rod adjustment. Please note that no case is included with this bass. Also please note, that any instruments that I sell, I have professionally packaged in custom boxes to avoid any damage. That is why the shipping may be a bit high. If you have any questions please feel free to contact me and I will answer them the best I can."