The first prototype of the Heinkel He 70, the He 70a V1, Werknummer 403, D-2537 (formerly D-3 until June 1933; D-UHUX as of 1934), Blitz. This aircraft was first flown in Warnemünde on December 1, 1932. It was then used for a number of international speed record flights and subsequently operated by Deutsche Luft Hansa for passenger flights until it was lost on November 3, 1934, at Carcasonne.
Photo taken at Berlin-Tempelhof airfield before its conversion; exact date currently unknown to me. (German Aviation 1919-1945 collection)