Champion was a small German car manufacturer that grew out of the postwar activities of Hermann Holbein, a former test and diploma engineer at BMW, born in 1910. After BMW's Munich operations closed at the end of the war, Holbein settled in Herrlingen near Ulm, where his wife owned a house, and initially worked with a wood-gas-converted Opel Blitz truck before returning to motor racing with rebuilt BMW-based cars. His…