cover 1900 (27 Nov.) printed O.H.M.S. XU5 from the G.P.O. at Hong Kong, addressed to "Custom House, Lungchow, via Langson (Tonkin)", showing black "HONG KONG" c.d.s. (27 Nov.) and red circular "SERVICE/DES/POSTES" on front, "LUNGCHOW" (5 Dec.), "LANGSON" (5 Dec.) and "HAIPHONG" (date unclear) c.d.s. on reverse, small tear at upper-left, otherwise fine. Photo