"1/5", arrival d.s. and, on reverse, "SINGAPORE/P.O." c.d.s. Scarce. Photo " /> U5 1863 (May) E. to London, bearing 1856 4a. grey-black pair and single, each clearly cancelled "B/172", showing red crayon <I>"1/5"</I>, arrival d.s. and, on reverse, "SINGAPORE/P.O." c.d.s. Scarce. Photo | Christie's