Aden. (Nigeria). 1939. Registered Nigerian postal stationery envelope 3d blue upgraded with Nigeria SG 52a, 2d rose and SG 56, 1s olive tied by Maiduguri double ring '31 Aug' with matching registered label addressed to Camp Aden, Arabia with 'Par Avion' label routed via Egypt with Cairo and Port Said transits '4th Sept' and Aden/Camp/Reg arrival '12th Sept' with 'Opened by Censor' label tied by framed 'Passed censor/By No 3/Aden' in violet. Lovely item of incoming mail from an unusual origin.