cover 1896 (26 June) opened-out commercial envelope registered from Shanghai to Nanking, "Insufficiently Addressed" and returned to Shanghai; bears a magnificient array of postal markings with unframed "PAID" in red, code "O" squared circle registered c.d.s. and boxed registered handstamp (Chang R1) both in black; "NANKING LOCAL POST" oval datestamp and boxed registered handstamp in violet with further Nanking oval, Shanghai squared circle and Shanghai Local Post c.d.s. applied on the return leg. A stunning and unique cover. Photo