It doesn't look like one of the supercharged 40 hp versions.
But it was... It is the Grofri Super Sport Kompressor with the 4/24/40HP high output engine.
But you mentioned this version, so I think you´ve deserved the point.
You would have guessed it anyway.
BTW, is that Käthe Rantzau at the wheel?
The female driver is Ms Grete Groß-Reinhardt.