The Corvair spawned a number of innovative concept vehicles including the Corvair SS, Monza GT, Monza SS, Astro I. In Europe, Italian coachbuilder Bertone designed a very advanced one-off prototype for the 1963 Geneva Motor Show; the "Chevrolet Testudo". This was among the first designs of Giorgetto Giugiaro, the chief designer at Bertone at the time. The Testudo later suffered a collision with another Bertone concept car, the Alfa Romeo Canguro, while on track at the Monza circuit. There was also a Pininfarina built concept called the "Corvair Speciale", and two other Pininfarina concepts known as "Coupe I" and "Coupe II".