Indeed, my second car was an NSU (which I understood to mean No S0ddin Use) until I saw this, the RO80.
Steve Thompson Racing of Walsall was the Audi NSU Mercedes dealer in the 70s, together with the then exotic and very pretty BMW's, oh so pretty.
I can't confess to ownership of an RO80, but the humble 2 cylinder 600, otherwise known as 'The Dustbin Lid'. The only car I have owned which had the perverse 'fail safe' of if the the throttle cable broke, it failed full open. Oh and a sack o' taters in the boot (front).
The Ro80 was a ground breaking machine of its time, even more so given the origins of the company at the time and a very brave company. One did have to be exceptionally brave oneself. Later the Patent was purchased by Mazda, when ceramic tips became viable, and did experience a RX7. Foooooffff
This example must be very rare, whoever has renovated it has done an exemplary empathetic job. This is a '71 K reg