"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.
Ten years previously :
NSU Prinz I, II & III
NSU Prinz I
Overview
Production 1958–1962
The first post-war NSU car, the Prinz I, was launched at the
Frankfurt Motor Show in September 1957 accompanied by the advertising slogan "Fahre Prinz und Du bist König"
("Drive a Prince and you're a king").
[4] After a pilot run of 150 preproduction cars,
volume production began in March 1958
NSU Spider : First appearing at the
Frankfurt Motor Show in 1964, the Spider featured a two-door cabriolet body based on that of the
NSU Sport Prinz coupé introduced back in 1959. Between 1964 and 1967 2,375 were built.
The NUS Prinz might not have been the most attractive and exciting rotary-engined car but was in full production WAY before the Cosmo.
I still love the Comso though and nice to see one in '70s orange instead of white !