Cut by the Ludwig & Mayer foundry in 1930*, after drawings by Karl Sommer. Motor is decorated with open stripes that look like chrome reflections or speed lines. No lowercase. There is also a solid cut named Dynamo, with a lowercase. Motor has been digitized more than once, most successfully by Steve Jackaman as Motorcross.
* Luc Devroye lists this designs as Vulcan with a 1929 date. However, this is not the Vulcan listed by Reichardt as a Mergenthaler face in Bold and Bold Italic from 1929.