Perfect answer Tonyola!
I´ve changed the initial puzzle pic, so now you can see Prof. Porsche´s face.
This car must have been a very early mock-up, as it does not stand on its wheels, but on massive blocks.
Contrary to the more streamlined coupés that came later, this one is a convertible with open rear wheelcases and more conventional bodywork.
Any further pictorial footage is welcome!
