cover 1869 (12 Oct.) envelope (slightly wrinkled at edges and small portion of reverse missing) from Derry addressed to "H.M. Ship Peterel, Sierra Leone", bearing G.B. 6d. mauve with adjacent h.s. "d1" in red (the amount due to the colony) and showing, on reverse, various marks including scarce "LIVERPOOL/P.L.O." c.d.s. and "SIERRA-LEONE" double-arc d.s.