G 1 ANNA" h.s. in blue, Calcutta Ship Letter d.s. and arrival c.d.s. The only recorded cover from Hong Kong with the duplex. Photo" /> cover 1866 entire (no side flaps) to Chittagong, bearing 1865 1a. brown and 2a. orange tied by Singapore "172" duplex and blue f.a.c. with, on reverse, faint "SINGAPORE/SHIP LETTER/PAID" d.s. in red partly overstruck by "CAL:G.P.O./B<V>G 1 ANNA" h.s. in blue, Calcutta Ship Letter d.s. and arrival c.d.s. The only recorded cover from Hong Kong with the duplex. Photo | Christie's