Considered the most valuable concept car of the late 1950s, the revolutionary Diablo concept car will be the star attraction of RM Auctions’ multi-million dollar Sports & Classics of Monterey event, to be held August 15th and 16th in downtown Monterey, California.

Conceived by Chrysler’s design head, Virgil Exner, arguably America’s most influential stylist, this rare example was built by Italian coachbuilder Ghia for the Chrysler Corp. on a 1955 Chrysler 300 series chassis.

A featured concept car for the 1957 US auto show circuit, the car is one of the largest and most impressive concept cars ever built, stretching an impressive 22 feet in length.