1983 Corvette
The ’83 Corvette was the start of a very successful C4 generation, and in the end, Chevrolet produced over 300,000 copies. But regular production started in 1984, and only one preproduction ’83 model was left in existence, which makes it the rarest Corvette of them all (via History).
There were 43 ’83 Corvettes built, but the common practice is to destroy the pre-production cars. And Chevrolet did just that, leaving only one in existence. This unique example is in Corvette Museum near the Corvette factory in Bowling Green, Kentucky.