Believe it! The original 1954 El Camino Concept is shown above and wasn't even a Chevy. It was a Cadillac. The two-seat show car originally debuted at the '54 GM Motorama with a fiberglass body and brushed aluminum top. A Cadillac 230hp overhead-valve V8 powered the 16.67-foot coupe. Styling was defined with the typical real tail fins and fluted side panels, and the interior had chrome-plated steering column, horn button and ring. It also had high-backed gunmetal gray leather seats. The 1954 Cadillac La Espada show car was essentially the convertible version of this car. This coupe obviously lent its name to the Chevrolet El Camino, which began production in 1959. 

Related: The Complete History of the Chevrolet Impala

[via Cadillac]