cover 1860-63 4d. rose wing-margin pair neatly tied by diamond of dots in blue on large part 1861 letter sheet to Calcutta, showing St. Denis c.d.s. (7.4) in blue, boxed "PF" in blue overstruck by one in red and, on reverse, Aden Steamer Point transit d.s. (17.4); the entire with some light discoloration along top and ink-etching to address. A very rare and unusual usage. Holcombe Certificate (1986). Photo