A Brief History of the Marque
Manufactured by Berliner Kleinmotoren AG, Mohren-Strasse 57, Berlin W8, from 1921 to 1924.
The origin of the 3-port deflector-type 143cc engine is obscure, and the extravagent advertising claims about the lightweight motorcycle did not lead to strong sales.
There was also Voran-Automobilbau AG (founded 1926) which does not appear related.
N.B. The word "Satan" appears to be written on the fuel tank. There was a Czech motorcycle of that name built in the early 1930s.