The Ford Mustang is an American automobile manufactured by Ford. It was originally based on the platform of the second generation North American Ford Falcon, a compact car. The original 1962 Ford Mustang I two-seater concept car had evolved into the 1963 Mustang II four-seater concept car which Ford used to pretest how the public would take interest in the first production Mustang. The 1963 Mustang II concept car was designed with a variation of the production model's front and rear ends with a roof that was 2.7 inches shorter. Introduced early on April 17, 1964, and thus dubbed as a "1964½" by Mustang fans, the 1965 Mustang was the automaker's most successful launch since the Model A. The Mustang has undergone several transformations to its current sixth generation.