It was the Elan SCX.
Otto Wiest took the first design for a parabolic ski to Head in Austria at least 5 years before Elan came out with the SCX. They couldn't understand and were reluctant to try a new ski design. I don't know how this can be documented, but I know it happened.
Otto was one of the first ski instructors in Vail when it originally opened. He is a genius. Otto would crack up that he is getting props on NS.