cover CANTON: 1899 (7 Oct.) two "Maus" envelopes, registered to Germany, bearing "C.I.P." 30c. with Hong Kong 30c. grey-green and "C.I.P." 50c. with Hong Kong 50c. on 48c. respectively, each cancelled appropriately with the Canton bilingual c.d.s., the type 1 "I.P.O." tieprint and Hong Kong c.d.s.; some tone spotting on one. (2)