Many thanks Pawel. Is interesting input, as far I could find it was a special bodywork build on the basis of W142 (Mercedes 320). But I do not could find any more about the details, numbers etc.
I agree, that it looks Italian and if the car was build before the WW2 it looks very modern. Although in the 30’ies was also in Germany the Trend to build the Streamline bodyworks like the “Mercedes 500K Autobahnkurier”.
Sebastian