A Brief History of the Marque
Manufactured in Munich from 1921 to 1937 by Otto-Werke GmbH, a German aircraft manufacturer.
Gustav Otto, son of Nikolaus Otto of "Otto-cycle" fame, produced an auxiliary bicycle engine in 1921, followed in 1924 by motorcycles marketed under the Flottweg marque. These were also sold under the name Otto from 1928 to 1930. It is understood that they employed JAP SV engines of 198cc and 293cc.
The firm also built a limited number of luxurious 6¾ litre automobiles in 1923/24.
Gustav Otto fell into depression and committed suicide in 1926 at the age of 43.
Sources: wikipedia.de, Tragatsch p244.
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