The Jaguar XK120 is a sports car manufactured by Jaguar between 1948 and 1954. It was Jaguar's first sports car since the SS 100, which ceased production in 1940.

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The XK120 was launched as an open two-seater or  roadster at the 1948 London Motor Show as a testbed and show car for the new Jaguar XK engine.

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The display car was the first prototype, chassis number 660001. The roadster caused a sensation, which persuaded Jaguar founder and design boss William Lyons to put it into production.

Source: Wikipedia.org