1876 (30 VIII) 25c. postal stationery envelope uprated 50c. from Basel to Yokohama, Japan, endorsed “Via Brindisi” whose transit cds of 2 Set appears on reverse together with Hong – Kong Marine Sorter/ Singapore to Hong Kong double-ring cds of OC 19, this appears to be an inverted ‘9’ in the date as there is an arrival cds of the Hong Kong office. Fine and very rare.