Auto Union began working on Grand Prix race cars in 1933, which saw their first racing season for 1934. Initial TYPE A and TYPE B models featured V12 engines, and garnished many racing victories. TYPE Cs featured a V16 engine, while final TYPE Ds used mostly V12s (and were equipped with dual rear wheels). This model shown is a 1938 TYPE D built with an earlier C V-16 engine. (Photo credit: Sean Connor)