The Schlörwagon

Built, just before the start of WWII, on the rear-engine Mercedes-Benz 170H chassis it was known as the Göttinger Ei (“an egg from Göttingen”) or the Schlörwagen. Its designer, Karl Schlör, a Krauss Maffei engineer, had proposed a bodyshell with extremely low drag coefficient as early as of 1936. The prototype dazzled the public at the Berlin autoshow of 1939. But, because of the outbreak of WWII, the Schlörwagen never actually went into production. Karl Schlör died in 1997.

Via Retronaut.