I have a vintage DI4 Distomat for sale. The unit was recently tested as operational by Seiller Instruments of St. Louis. They also re-built one battery pack. It comes with 2 battery packs (one is working with new batteries), battery connection cables, operating manual, original packing case, and a counter-balance for an old-style T-2. I also have the mounting plates for the old-style T-2 and a counter-balance for an old style T-16. There is one other counter-balance but I can't determine the model to which it attaches (maybe T-1A). The battery connection cable works but some the exterior insulation has deteriorated.