1889 (May 6) Incoming Ceylon 5c postal stationery envelope addressed to “HMS Reindeer / Zanzibar or elsewhere”, one of the Anti-Slave patrol ships in action off the East coast of Africa, uprated with four 1886 5c tied by indistinct numerals, with Batticaloa, Colombo and Aden cds, some soiling, very rare if not unique usage to an Anti-Slave ship