The straight-armed Balkenkreuz (bar cross), which is a stylized version of the Iron Cross, was the emblem of World War II Wehrmacht-Heer, Luftwaffe, and Kriegsmarine.
It was first adopted in mid-April 1918 by the Luftstreitkräfte of World War I Germany, only about a week before the death of Manfred von Richthofen, and used from that time to the end of World War I, and its use resumed, with new standardized dimensions from the beginning of the Third Reich's Luftwaffe in 1935, to the end of World War II in Europe. The Luftwaffe would use two specifications for the Balkenkreuz, one with narrower white "flanks" on upper wing surfaces, and one with wider white "flanks" beneath the wings and on the fuselage sides of German military aircraft.
Taken at the Imperial War Museum Duxford, Cambridgeshire.
Thanks for all the C&Cs on 'Sally B'.
Imperial war museum duxford
Messerschmitt Bf 109