A Brief History of the Marque
Manufactured by Bungartz and Co., Munich
An established builder of tractors, in 1934 they added an automobile to their lineup, the Bungartz Butz. Designed by Josef Ganz, the tiny two-seater was propelled by a water-cooled 400cc two-stroke twin mounted above the rear axle.
The machine did not achieve market penetration and was shelved within the year.
Ganz, a Jew, was persecuted by the Nazis and fled to Switzerland. His contribution to the development of the Volkswagen was never recognised, and he died, impoverished, in Australia.
The Butz and its creator are discussed in more detail here: Josef Ganz
Sources: Oldtimerclub Lachendorf, et al