cover 1866 (Feb.) envelope (flap missing) to Boston, U.S.A. bearing 1862 no watermark 18c. lilac strip of three with wing-margin at left and with perfs clipped or cut off at top, each clearly cancelled "B62", showing firm's cachet, London Paid (12.4), "BOSTON AM. PKT./PAID" (26.4) c.d.s. in red, "21/CENTS" accountancy h.s. and, on reverse, part Hong Kong transit c.d.s. (27.2). A rare and remarkable franking. Photo in colour