1929 (15 Dec) Switzerland Airmail 'Graf Zeppelin' illustrated postcard from Zurich to Roma (Italy), flight to Africa (Image)

1929 (6 Aug) United States, Graf Zeppelin airship airmail cover from New York to New Jersey, 1st Round the World flight 'Lakehurst - Lakehurst' (Sieger 28 D, CV $100) (Image)

1929 (27 Aug) United States, Graf Zeppelin airship airmail cover from Chicago to Frankfurt, 1st Round the World flight 'Lakehurst - Friedrichshafen' (Sieger 28 A) (Image)

1929 (31 Aug) United States, Graf Zeppelin airship airmail cover from Lakehurst to Berlin, 1st Round the World flight 'Lakehurst - Friedrichshafen' (Sieger 28 A) (Image)

1930 (31 May) United States, Graf Zeppelin airship airmail cover from Brooklyn to Hamburg, 1st Pan-American Round Flight 'Lakehurst - Sevilla - Friedrichshafen' (Sieger 64 G, CV $780) (Image)

1931 (24 Sep) Brazil, Graf Zeppelin airship airmail cover from Pernambuco to Friedrichshafen, Flight to South America 'Recife - Friedrichshafen' (Sieger 130 B, CV $90) (Image)

1932 (23 Mar) Brazil, Graf Zeppelin airship airmail cover from Rio de Janeiro - Jerusalem via Beyrouth, Flight to South America 'Recife - Friedrichshafen' (Sieger 131 B) (Image)

1932 (11 Oct) Brazil, Graf Zeppelin airship airmail cover from Sao Paulo to Leipzig, Flight to South America 'Recife - Friedrichshafen' (Sieger 190 A, CV $210) (Image)

1934 (2 Jul) Brazil, Graf Zeppelin airship Registered airmail cover from Recife - Eisenach, Flight to South America 'Recife - Friedrichshafen' (Sieger 255 B) (Image)

1931 (29 Mar) Hungary, Graf Zeppelin airship airmail cover from Budapest to Szekesfehervar Airdrop Debrecen, Flight to Hungary 'Friedrichshafen - Budapest' (Sieger 102 Ba, CV $180) (Image)

1933 (29 May) Italy, Graf Zeppelin airship airmail cover from Rome to Washington (United States), Flight to Italy 'Rome - Friedrichshafen' (Sieger 205 B, CV $240) (Image)

1929 (21 Aug) Japan, Graf Zeppelin airship airmail postcard from Tokyo to Hamburg, 1st Round the World flight 'Tokyo - Friedrichshafen' (Sieger 31 C, CV $900) (Image)

1930 (17 May) Spain, Graf Zeppelin airship airmail cover from Barcelona to Chicago (United States), 1st Flight to South America 'Sevilla - Lakehurst' (Sieger 58 E, CV $420) (Image)

1930 (18 May) Spain, Graf Zeppelin airship airmail cover from Sevilla to Pernambuco (Brazil), 1st Flight to South America 'Sevilla - Pernambuco' (Sieger 58 Ab, CV $90) (Image)

1930 (18 May) Spain, Graf Zeppelin airship airmail cover from Sevilla to New York (United States), 1st Flight to South America 'Sevilla - Lakehurst' (Sieger 58 B, CV $150) (Image)

1930 (19 May) Spain, Graf Zeppelin airship airmail cover from Sevilla to Pernambuco (Brazil), 1st Flight to South America 'Sevilla - Pernambuco' (Sieger 58 Ab, CV $90) (Image)

1930 (4 Jun) Spain, Graf Zeppelin airship airmail cover from Sevilla to Friedrichshafen, 1st Flight to South America 'Sevilla - Friedrichshafen' (Sieger 58 F, CV $540) (Image)

1933 (6 May) Spain, Graf Zeppelin airship airmail cover from Barcelona to Rio de Janeiro, Flight to South America 'Friedrichshafen - Recife' (Sieger 203, CV $60) (Image)

1930 (21 May) Uruguay, Graf Zeppelin airship airmail cover from Uruguay to Friedrichshafen, 1st Pan-American flight 'Recife - Friedrichshafen' (Sieger 61 B, CV $60) (Image)

1936 (5 Jul) Belgium mailed by balloon 'Belgica' postcard from Brussels to Blankenberge via Cesky Tesin (Czechoslovakia) combine franked with special postmark to this flight (Image)

1935 (30 Aug) Poland, Balloon Airmail cover from Warsaw to Lodz with the special postmark and stamp (Image)

1935 (15 Sep) Poland Registered Express Balloon Airmail cover from Warsaw to Bydgoszcz (Image)

1936 (30 Aug) Poland, Balloon Airmail cover to Warsaw with the special postmark, stamp, and vignette, franked with half of Mi #313 (Image)

1936 (30 Aug) Poland, Balloon Airmail cover from Warsaw to Lublin with the special postmark and stamps (Image)

1936 (30 Aug) Poland, Balloon Airmail Registered cover from Chotynicze to Sweden with the special postmark and stamps (Image)