1913 Germany Pioneer Airmail Real Photo Postcard (RPPC) – Mülhausen to Feldberg. This rare pioneer flight card features a real photograph of the pilot standing before his Aviatik biplane, signed in ink on the front by the pilot, Arthur Faller. The card was flown on the "First Flight Mülhausen-Feldberg" on July 13, 1913. It is franked with the scarce red 25pf Semi-Official Airmail stamp ("Erste Flugpost Mülhausen-Feldberg"), tied by the special commemorative airmail cancel dated July 13, 1913. A standard 5pf Germania stamp is also affixed, cancelled with a "Mülhausen (Els.)" circular date stamp. The reverse features a distinct purple cachet from the "Hotel Feldbergerhof" (1500m), confirming the arrival at the destination in the Black Forest. The image also bears the photographer mark of A. Faller (Mülhausen), likely a relative of the pilot.