Set of pics (above) was found on an earlier Reverb listing, but I wasn't able to get the details from the auction. It's the same guitar as below, however, as confirmed by the CT pickup, wear marks on the neck, slot-style Schaller tuners, and replacement pickup screw.
A553D came up on the Reverb web site in November 2015 and is being offered at $3,995 by dealer Roadhouse Vintage in Calgary. The guitar has some unusual features, not the least of which is a rare Country Treble pickup (but no other pickups). Along the way the guitar has also been converted to a tune-o-matic bridge, so local buyers will have an advantage in determining action and intonation. Pickguard is said to be complete and not cracked around the input jack or switch. Comes with its original Dan Armstrong case. A553D is also notable for its slot-style Schaller tuners. These were commonly found for a brief period on 1970 guitars, but are unusual on this 1969 example. We think they look cool, and could well be original to the guitar on a day that Ampeg ran short of the regular tuners, or somebody just slipped this set into a larger Schaller shipment. Since Schaller tuners were an OEM-spec during this time period, there really wouldn't have been any reason to swap a set of slot-style Schaller tuners for conventional ones. So our view is that the tuners are original to the guitar.
"Up for sale is a highly collectable, vintage 1969 Dan Armstrong / Ampeg Lucite Electric Guitar. The Dan Armstrong really reached notoriety when it surfaced in the hands of Keith Richards in the late 60's / early 70's. The Lucite guitar is in excellent condition with not to many signs of wear either pick marks which I'm sure can all easily be buffed out with a skilled luthier on a buffing wheel. It features a Brazilian Rosewood fretboard and is in 100% original condition. The guitar weights over 9.5 lbs, comes with the CT (Country Treble) pick up, bears the serial number A553D and comes with its original Armstrong case. As opinions vary, please review all pictures for condition. Please note that the buyer to pay all shipping, insurance and import charges. If you have any questions or need further information, please feel free to email or contact us directly through the Roadhouse Vintage store page which lists our email and contact phone number."