Unused on cover / entire letter 1903 (30 Jan.) opened-out envelope to the "Hon Secretary, R.A. Mess, Aden", marked "On active service, no stamps available", showing rare small "ADEN/UNPAID" oval d.s. in green (2.2), unframed "ACTIVE SERVICE/UNPAID" h.s. in purple, framed "POSTAGE DUE ANNAS", semi-circular "ADEN/DUE/ANNA" and, on reverse, Berbera c.d.s.; also 1903 (3 April) envelope to a Petty Officer on board "Perseus" at Bombay, readdressed to Bushire and Muscat, headed "G. Dyer L.S., Wireless Telegraphs, Somaliland, East Africa" and marked "No Stamps available", countersigned by officer and with several transit and arrival d.s. Also Rhodesia 1896 (10 April) cover to England bearing 1892 6d. tied by "BULAWAYO/RHODESIA" c.d.s. (Matabele Rebellion). An interesting trio