Chungking: Type 1; 1899 (13 June) envelope (slightly reduced at left) to England, bearing C.I.P. 2c. orange and 4c. bistre-brown pair tied by superb strikes of the Chungking bilingual c.d.s. with Hong Kong 10c. purple on red cancelled by a superb strike of the unframed "I.P.O." tieprint and Shanghai c.d.s. (26.6), the reverse with Shanghai c.d.s. overstruck by Slough arrival (3.7). A stunning and highly important cover, this is one of the earliest recorded dates of the Chungking bilingual c.d.s. and the tie print is rated RR in Webb's Guide.