Heinkel He 46 E WL-IGYK (originally D-IGYK), Werknummer 857. According to the notes on the rear of the original picture, this two-seat reconnaissance aircraft was photographed in front of hangar 3 in Neukuhren, in what was then East Prussia, on a rainy September day in 1939. This He 46 was assigned to Wetterflugstelle Königsberg as well as Schule/FAR. 10.
Note typical lack of NACA cowling for this He 46 subtype, and Schwarz Propellerwerk manufacturer's logo on the lower propeller blade. Camouflage appears to be standard 70/71/65. The aircraft seen in the background are Junkers W 34 hi transports. (German Aviation 1919-1945 collection; additional aircraft identity confirmation courtesy of luftwaffe-research-group.org)