cover -- 1900 (1 Jan.) "Maus" red band envelope, registered to Germany, bearing "C.I.P." 1c., 2c. (2), 5c. and 10c. tied by fine Wuchow c.d.s. with Hong Kong 10c. purple on red pair cancelled by the "I.P.O." tieprint and Hong Kong c.d.s.; fresh and fine