Hollywood Actor Gary Cooper's 1935 Duesenberg SSJ Speedster First American Supercar. Gary Cooper’s 1935 Duesenberg “SSJ″ is one of the most extraordinary cars of the Classic era, with a 400-horsepower supercharged straight-eight engine placed in an abbreviated speedster chassis. The rare 1935 Duesenberg SSJ earned the title of most expensive American car to ever be sold at auction. It sold for an astounding $22,000,000 at the Gooding & Company auction during the 2018 Monterey Car Week, which is