But : "As the world’s first production Wankel rotary-powered car, and one of only 343 Series 1 examples, the Cosmo stands as quite a unique prospect."
10 years previously.......: https://en.wikipedia.org/wiki/NSU_Prinz
"10 years previously" was what?
NSU's Spider - the first Wankel-license engined road car to hit the market - debuted in 1964. Mazda showed their own Wankel-licensed rotary engine designs at the 1963 Tokyo Motor Show (two engines were put on show) and the complete Cosmo Sport was on show at the 1964 Tokyo Motor Show. The Cosmo just didn't start full production until late 1966.
The ad is wrong, but only just.
The NUS Prinz might not have been the most attractive and exciting rotary-engined car but was in full production WAY before the Cosmo.
But that's the whole point. The NSU Prinz was not rotary powered...
The NSU Spider was.