Here are some more pictures. I think it is the BMW 326 Wendler Coupé built for BMW which appeared on the title of the
BMW Blätter magazine in 1938. It differs in details from the better known one for Dipl.-Ing. Hornschuch which was pictured in the Wendler brochure. While the Hornschuch car was a three-seater with a transverse rear set, the BMW coupe was a four-seater. The last two pictures show the Hornschuch car for comparison.
I don't know what the
Dr. WW stands for.