The deeper I dig, the more I get confused. At first I found the puzzle picture showing the car with starting number 5 and identified as Wilhelm von Müller. Meanwhile the same picture appears claiming the car to be the BMW 315 Spezial by Toni Neumaier. Furthermore another picture, showing the same car at the same race, but with starting number 3 appeared, also captioned as Neumaier-BMW.
Anybody able to clear this up?