Shame it's not about 20 miles south of where it actually is.... I'm heading in the direction of Karlsruhe a fortnight on Friday, en route to Austria.
The NSU K70 was intended as a stablemate for the Ro80, with a 1.6 engine and not a rotary. VW then took the car and the tooling to its range and an underused factory, and it became their first FWD water cooled car and set the scene for the Passat.
I see plenty of K70s at NSU meetings, most were built as VWs but owners change the badging to NSU items.
Did you know the Polo was born out of the NSU K50? Today's Porky Polo is a direct descendent of the Prinz. Without Daimler and NSU we wouldn't have today's VW and Audi.