, bearing 8p. purple tied by unclear "B/172", showing firm's red cachet at lower left and poor "SINGAPORE/P.O." c.d.s. on reverse. Rare. Photo" /> cover 1865 (1 June) circular to Hong Kong, marked<I> "Printed Circular"</I>, bearing 8p. purple tied by unclear "B/172", showing firm's red cachet at lower left and poor "SINGAPORE/P.O." c.d.s. on reverse. Rare. Photo | Christie's