1933 (May) Zeppelin 1st South America Flight reg’d cover with cplt. Pigeon airmail set (plus 2 extra 50s values) tied at Sofia (May 3 cds), sent via Berlin with connecting flight cachet, Pernambuco bs (May 9), a lovely franking, very fine and scarce (Sieger 202 Ba, € 850) (Image)

1934 (August) Zeppelin 6th South America Flight, attractive reg’d cover with four diff Pigeon values tied by Sofia airmail cds (Aug. 15), sent on via Berlin (cachet and Aug 16 bs) and F’hafen (Aug. 18 cds), flight cachet (code b), carried to Pernambuco (bs Aug. 22), scarce and very fine (Sieger 268, € 350) (Image)