cover 1860 (Feb.) entire letter from the "Heard" correspondence to Hong Kong, bearing 1856 1a. strip of four cancelled "B/172" and showing despatch and arrival c.d.s. on reverse; also 1859 and 1864 part front and backs to England, the first bearing 1855 4a. pair and the second bearing 1856 2a., 8a. and 1860 8p., all clearly cancelled "B/172". Photo