1938 Adler Trumpf Rennlimousine.
In the latter half of the 1930's, most racing cars remained open-cockpit in design, sent power to the rear wheels (Harry Miller's FWD Indy Car excepted), and featured the most powerful engines allowed by competition rules. German automaker Adler believed it had a better idea, and its Trumpf Rennlimousine was a combination of rolling laboratory, race car and show car. Roughly six were built, and three are known to survive today.
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Source: hemmingsblog.com