cover TIENTSIN: 1899 (15 May) long envelope (224x100mm) commercial envelope, registered to Leipzig, bearing "C.I.P." 1c., 2c., 4c. (3) and 5c. (3) tied by blue pa kua with Tientsin bilingual c.d.s. in blue alongside, Hong Kong 10c. purple on red (3) cancelled by the first type "I.P.O." tieprint (also in blue) and Shanghai c.d.s., with large "R" in red and "R" in circle in black; vertical filing fold clear of the adhesives, a stunning cover. Photo