1933 (Sept.) Zeppelin 6th South America Flight, reg’d printed matter cover franked with total 1s 3 1/2d “TANGIER” ovpts. incl. 2 diff. blocks of 4, all with oval reg’d ds (28 August), sent via Berlin with connecting flight cds, Pernambuco receiver (6.IX.33), very fine showpiece (Sieger 229 B, € 450) (Image)