Germany, Luftwaffe. A Rare Signed Photo of Ernst Udet in Flight

(Ernst Udet Foto mit Unterschrift). A rare signed photo of First World War fighter ace Ernst Udet in flight, depicted at the helm of a Focke-Wulf Fw-44 Stieglitz, flying just underneath a Zeppelin in the Frankfurt area, the image overlaid by Udet’s handwritten signature in black ink, along with a date of “11. 3. 37”, the reverse bearing an additional handwritten inscription, measuring 120 mm (w) x 90 mm (h), in extremely fine condition.