I´ve had the luck to purchase the original 1967 Maybach FIF (= Fahrzeuginstandsetzung Friedrichshafen / former Zeppelin AG) press photo, which shows TT-AP 80, the former Brunner-Schwer car and the other TT-AP 81 Spohn car, then owned by the Mercedes Museum.
So here´s a better version of my former pic: