Built, just before the start of WWII, on the rear-engine Mercedes-Benz 170H chassis it was known as the GÃ¶ttinger Ei (“an egg from GÃ¶ttingen”) or the SchlÃ¶rwagen. Its designer, Karl SchlÃ¶r, 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 SchlÃ¶rwagen never actually went into production. Karl SchlÃ¶r died in 1997.