cover 1873 envelope (opened out for display) registered to Calcutta, bearing 1863-72 3d. and 1/- cancelled "B53", showing oval registered d.s., h.s. "10d" and with Aden Steamer Point c.d.s. on reverse, and 1883 Eastern Telegraph Co. envelope (defective in one corner) registered from Aden to Mauritius, bearing 2a. and 3a. cancelled "B" in bars