These NSUs were the world's first production rotary-engined car. Production estimates vary, but are anywhere from 3000-5000 units were made between 1964-1967. As you might expect, it didn't work out very well. Apex seals and other engine problems quickly developed and few survive today. The experiment was not completely a failure; NSU's patents survive today under license by Mazda and the produced the wonderful rotary-powered RX-7 Series.
Styled by Bertone, these Spiders were available in either white or red and offered surprisingly brisk performance. In period a few were campaigned for rallyes and hillclimbs. Here is a video of another single rotor Wankel Spyder to give you an idea of the sounds and feel of this unique powerplant: