1925 (2 Feb) RAF Demonstration Flight, Calcutta-Risalpur, cover franked with 1a George V adhesive, with large violet "Calcutta-Risalpur Demonstration Flight, Calcutta 1925" flight cachet, also "Calcutta-Risalpur Air Flight from Calcutta" in green ink, addressed to Stephen Smith in Ambala, endorsed "Ft. Lt. Graham" (pilot) at top, arrival backstamp, two hinge remnants on back, v.f., only 35 covers carried to Ambala