Two The World Series of Auto Racing Medaillons presented by Raybestos Brakes to Bobby Unser for his participation in 1974 and 1975. At tracks such as Trenton and Pococno the World Series of Auto Racing had twelve drivers compete in four different types of race cars including Indy cars, stock cars, midget cars, and sprint cars. From the Estate of Bobby Unser, 3-time Indianapolis 500 winner.REF#BUFT1416