Focke-Wulf Fw 58 "Weihe" advertising by Focke-Wulf Flugzeugbau A.-G., Bremen, published in Transaer 1937 - Handbuch des internationalen Luftverkehrs [Handbook Of International Air Transport], edited by Fischer von Poturzyn, Dr. Heinz Orlovius, and August Dresel, 538 pages, published as an edition of 2000 copies, by Richard Pflaum Verlag, Munich, Germany, 1937.
Incidentally, the Fw 58 A-0 shown in the photo, D-ALEX, was Focke-Wulf chief designer Kurt Tank's personal short-range liaison aircraft, owned by the Focke-Wulf factory. (Fischer collection)