1899 (July 2) “China” overprinted 10pf postal stationery card from nanking to Diedenhofen, showing bilingual cds of nanking on dispatch at left, struck in transit with bilingual cds of Shanghai (3.7) of the Chinese P.O., where the denomination was cancelled with framed “I.P.O.” hs, entering the German P.O. at Shanghai with corresponding cds applied on the franking, an extremely rare usage of the I.P.O. postmark, an exhibition item of exceptional and delightful quality; cert. Steuer (1993).