postal stationery 5 pfennigs imperial yacht, commercially used with cancellation "BUKOBA", carried across Lake Tanganyika, transit cancel "KISUMU", terminus of the British Uganda Railway and an additional transit postmark "MOMBASA", starting point of the Uganda Railway, to Germany with arrival postmark, very fine, rare (7 % import duty will be charged on the hammer price, if this lots is shipped within the EC or the UK).