cover 1841 (24 Jul.), GA-GF, a large margined strip of six, neatly cancelled and tied in black to envelope used from Thurso and addressed to "Captain Henderson, H.M.S. Gorgon, Mediterranean"; faint tone at base of GD-GE. A very fine and rare overseas destination cover. Diena (1958) and B.P.A. (1996) Certificates. Photo