Kdo. Nowotny markings : STOP THE MYTH !

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Ok, it definitely seems that this intermediate wooden experimental fin can be identified from its non flat under part. And it was not specific to the “snake” fins as you will see bellow with rudder from “17+S” 110956 left & right, “B3+CL” 110567 right side only (note missing cap) and finally one more from “9K+FH” showing that it was finally not so dark on her right side at least, probably some kind of red or yellow over-sprayed with a dark-green serpentine.

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Sources:
Photo1 > Burindo “Famous Airplanes of the World” No.115.
Photo2 > Luftwaffe Warbirds Photo Album Vol.3, Delta Pub., 1993.
Photo3 > “Wings of the Black Cross”, Nb 3, M.Proulx, 2005.
Photo4 > “JV44, The Galland Circus”, R.Forsyth, 1996.