cover -- 1900 (10 Dec.) 1c. C.I.P. reply card addressed to Dresden bearing additional C.I.P. 1c. and 2c. tied by Wuchow bilingual c.d.s., Hong Kong 4c. grey cancelled by Hong Kong c.d.s. and the boxed "I.P.O." tieprint with arrival c.d.s. at left and Canton bilingual transit on reverse; the reply section is with similar adhesives, the Chinese cancelled by the Wuchow c.d.s.; very fine and unusual