[sidney]

Although I have immense respect for your research work at Bundesarchiv-Militärarchiv in Freiburg, I took my reference from Prien, Stemmer and others, Jagdflieger Verbande der Deutschen Luftwaffe 1934 - 1945, Teil I. There they mentioned He 51 A-1, B-1, B-2 (the floatplane) and C-1 variants. Somehow I doubt that they could get their references that wrong to mistake the A-1 and B-1 models for the prototypes. Nevertheless, I propose that we put our difference on the He 51 aircraft model aside for the time being, and try to concentrate on the unit (believed to be I./136), time when the photo was taken and, of course, the emblem motif interpretation.