Air Mail cover 1915-16 group with 1915 stampless picture post card of Heligoland with Heligoland airport cachet, 1916 Norderney naval station cover with appropriate cancellations and h.s. (front only), Prisoner of War facsimile letter endorsed "BY BALLOON" (filing punch hole)
Air Mail cover 1915-16 group with 1915 stampless picture post card of Heligoland with Heligoland airport cachet, 1916 Norderney naval station cover with appropriate cancellations and h.s. (front only), Prisoner of War facsimile letter endorsed "BY BALLOON" (filing punch hole)
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