This Dan Armstrong came on the market in September 2016 with an asking price of $2,000. Been a number of mods over the years, including tuners, pickup, and added inlays along the fingerboard. Comes with the OHSC.
"1969 Ampeg Dan Armstrong Lucite bass. Excellent condition. Pickup is not original. Has vintage DiMarzio mud bucker from the mid 70s. Sounds awesome and plays well. Comes with two extra bridges, thumb rest, and original hard shell case. Serial number is D737A. Hate to sell but has to go."