This thing exists.
I can’t remember ever seeing a Prinz before.
Your correspondent finds himself in Paris for the weekend and so thoughts turn to matters French.
Yes, it’s an NSU Quickly. The yellow margarine tub behind the seat is the luggage space.
When somebody brings up the rotary engine, the mind naturally wanders to Mazda, but it was German based NSU Motorenwerke AG (later absorbed into Audi/VW) that allowed engineering genius Felix Wankel to design and release the first production rotary engine in an automobile.
It's so cuuuuuuuuuuuuuute