1929 Round-the-World flight cover from New York to Friedrichshafen, Maybach Motor Company stationery imprint on backflap, with "F.W. von Meister, Special U.S. Representative Luftschiffbau Zeppelin G.M.B.H." handstamp, cover signed by Dr.Eckener and most of the crew members, (Image)

Est.US$250

1930 (15 May) card from Panama City, via Havana, Cuba (18 May Flag cancel on back) to New York, where U.S. 65c Zeppelin stamp was added for further transmission to Germany, with Europe-Pan-America Round Flight cachet and Friedrichshafen (6.6.) arrival pmk, all on front, v.f., signed I. Heiman, rare (Sieger 64X) (Cat No. C13) (Image)

Est.US$1,000

1935 G.W.Bartlett triple combination flight cover, United States 50c Century of Progress (May 8) to Brazil, from Brazil (24 May) to Germany, From Germany (30 May) to United States via Catapult "SS Europa-New York", additional franking and red cachet on back, fine and remarkable cover (Image)

Est.US$750

1936 (24 Apr) cover from Mexico to USA, attractively franked, unclaimed, with U.S. franking added on reverse and flown from New York (May 11) on the Hindenburg to Germany, with violet cachet and Frankfurt arrival pmk, fine and unusual cover, rare (Si.409T) (Image)

Est.US$250

1936 Hindenburg flight cover from Port-Au-Prince to Germany, mixed franking with U.S. adhesives added in New York (May 11), with violet cachet and Frankfurt arrival pmk, minor adhesive toning, v.f. and scarce (Si.409Q) (Image)

Est.US$500

1937 (6 May) cover addressed to Hermann Sieger, with red "Mail Via Airship Hindenburg" label, franked with 2x20c green, canceled New York, May 6, 1937, handstamped "Return to Sender", with four-line "intended for the first eastbound trip of Airship :Hindenburg" in 1937. Could not be forwarded on account of accident to Airship, May 6, 1937" (this cover was posted only 5 hours before the destruction of the "Hindenburg") (Si.454Ea) (Image)

Est.US$150

1939 legal-size cover franked with 30c (C24), flown from New York to Germany, with "First Trans-Atlantic Air Mail Services by Imperial Airways" and "LZ 130 Graf Zeppelin" printed cachets, German 3M adhesive added in Frankfurt, carried to Eger on the Sudeten-flight, with corresponding cachet and arrival pmk on back, fine and impressive mixed franking cover (Si.462) (Image)

Est.US$250