Gladstone Airways. 1927 Sudan 5m postal stationery envelope with a further 5m stamp, both uncancelled, initialled by the sender Ewart Scott Grogan on both sides, addressed to "His Royal Highness The Prince of Wales K.G, St. James Palace, London, England", handstamped violet "Carried by the Airline between / Khartoum and Kisumu, Kenya Colony / Pilots signature" (signed T.A Gladstone) with a Heliopolis c.d.s (Feb 21) on the front, backstamped at Cairo, two postage due marks obliterated. One of just two recorded covers flown on the first flight from Khartoum to Kisumu and on the return flight back to Khartoum, an exceptional cover. Photo on Page 32. (Image1)

1927 (Oct 23) Registered cover from Manyoni to the USA inscribed "Airmail Kisumu - Khartoum via Mwanza", with manuscript registration label of Manyoni, franked by Tanganyika 15c + 40c + 50c and U.S Air Mail 15c all cancelled in transit at Sigida, the U.S stamp further cancelled by blue crayon and again at Chicago with a duplex datestamp. Intended for the Gladstone Airways service but sent by surface mail via Dar-es-Salaam due to the crash of the "Pelican" on the 17th, which caused the air service to cease. U.S Air stamps were available in many foreign countries to pay for internal air mail within the USA. A little staining to the U.S air stamp, otherwise fine and a scarce use of U.S Air stamps in Tanganyika, backstamped at Dar-es-Salaam, London, Chicago and Little Falls, fine. Photo on Page 32. (Image1)