Air Mail cover 1914 (Jan.) Khartoum to Cairo return flight by Marc Pourpe, an envelope bearing Sudan 1m., 3m. and 4m. and tied by "ABU HAMED" bilingual c.d.s. (21.1), showing the flight cachet (on front) in blue and (on reverse) in violet; Shellal-Halfa T.P.O. (23.1), Halfa-Khartoum (23.1) transit and Cairo (26.1) arrival c.d.s. Fine and rare. Photo