 It was agreed Franz Knobel & Sohn GmbH (later called Westfalia Werke) would build the vehicles at the behest of VW.Several prototypes were designed until production started in 1964.Most cars were sold to the Deutsche Bundespost, but also to Swiss Post Offices (in an upgraded version with a more powerful 1.3 L engine, disc brakes and a block heater) and to the Lufthansa for apron use.