1928 (October 11-15), America Flight cover to US, franked by 4m black brown, cancelled by Friedrichshafen ''7.OKT.28'' ds, blue oval confirmation cachet, NYC ''Oct.16.1928'' drop marking, VF and scarce, Sieger #21g, €850, including €100 premium for Zeppelin stamp franking, Est. $250-$300 (Image)

1929 (March 24-28), two Orient Flight covers addressed to Port Said or Athens, franked by Eagle 2m black and blue, each one tied by Friedrichshafen ''24.MRZ.29'' ds, two different types of confirmation cachet and arrivals of March 28 to Port Said and March 30 to Athens, F/VF, Sieger #23 var, Est. $200-$300 (Image)

1929 (May 16), 1st America Flight cover, franked by Zeppelin 4m black brown, tied by board ''16.5.29'' ds, blue confirmation cachet on front and Barcelona drop ''16.MAY.29'' marking, VF and rare, only 19 items were dropped in Barcelona, Sieger #26b, €2,000, Est. $500-$600 (Image)

1929 (May 16-17 and August 1-5), 1st America Interrupted in Cuers and Completed Flights cover and card, franked by Zeppelin stamps of 4m and 2m respectively, each one with blue Flight cachet, first one has interruption message in red, each one with NYC ''AUG.5.1929'' ds, both are VF, Sieger #26A, 27A, Est. $150-$200 (Image)

1929 (August 15 - September 4), Around the World Flight cover to Switzerland, franked by Zeppelin 2m ultra and three 4m black brown, cancelled by Friedrichshafen ''15.AUG.29'' ds, red Flight marking and straight line confirmation, Friedrichshafen ''4.9.29'' receiver, mostly VF, Sieger #30Ad, €500 without premium for franking, Est. $200-$250 (Image)

1929 (September 26), 1st Switzerland Flight cover, franked by five Eagle stamps of 5pf-50pf, board ''26.9.1929'' cancellation, Bern the same day arrival ds, VF, Sieger #35h, €350, Est. $200-$250 (Image)

1929 (October 2), 4th Switzerland Flight pre-printed postcard (view of Hamburg), franked by two Eagle Air Post values, ''2.10.1929'' on board cancellation, Bern the same day arrival marking, VF, Sieger #39c, €330, Est. $150-$200 (Image)

1929 (October 12-13), Netherlands Flight postcard (real photo of L.Z.127) to Rotterdam, franked by four Eagle stamps of 5pf-20pf, tied by on board ''13.10.1929'' ds, three confirmation cachet and Amsterdam arrival marking in black, minor red ink soiling on picture side, otherwise VF, Sieger #41B, Est. $100-$150 (Image)

1930 (April 12), Switzerland Flight postcard (Graf von Zeppelin) to Zurich, franked by Eagle stamp of 1m black and salmon, cancelled on board ''12.4.1930'' ds, the same day Basel arrival marking, mostly VF, Sieger #51C, Est. $100-$120 (Image)

1930, Spain (April 16) and Darmstadt (August 4) Flights cover and postcard, franked by Zeppelin 2m ultra or Eagle 1m black and salmon, both with on board cancellations, first one with oval Flight cachet and Seville arrival ''16.APR.32'', the other one with Darmstadt arrival marking, VF, Sieger #52 and 78, Est. $150-$200 (Image)

1930 (May 25), South America Flight postcard (Graf von Zeppelin) to Rio de Janeiro, franked by Zeppelin 1.SUDAMERIKA Fahrt 2m ultra, cancelled on board with ''25.5.30'' ds, red Flight marking and violet oval the same day Rio arrival ds, mostly VF, Sieger #57c, €675, Est. $150-$200 (Image)

1930 (May 18-27), South America Flight cover to Pernambuco, franked by Zeppelin 1.SUDAMERIKA Fahrt 4m black brown, tied by Friedrichshafen ''18.5.30'' ds, red Flight cachet, two Pernambuco ''27.MAI.30'' receivers, mostly VF, Sieger #57K, €575, Est. $150-$200 (Image)

1930 (May 18-31), South America Flight cover to California, franked by Zeppelin 1.SUDAMERIKA Fahrt 2m ultra and vertical pair of 4m black brown, cancelled Friedrichshafen ''18.5.30'' ds, red Flight marking, Lakehurst ''MAY 31.1930'' drop and Delano arrival hs, mostly VF, Sieger #57F, €550 without a premium for franking, Est. $300-$400 (Image)

1930 (August 19), Switzerland and Vaduz Flight cover, franked by Zeppelin stamp of 2m ultra, cancelled on board ''19.8.1930'', Hugo Eckener signature alongside, Vaduz ''19.VIII.30'' arrival ds, VF and scarce, Sieger #79B, €600, Est. $250-$300 (Image)

1930 (September 23), Baltic Sea Flight postcard (L.Z. 127 in Flight), franked by Eagle 1m black and salmon, tied by Friedrichshafen ''23.9.30'' ds, green confirmation marking, Berlin the same day receiver, VF, Sieger #88Aa, Est. $100-$150 (Image)

1930 (September 25), Baltic Sea Return Flight postcard to Zurich, franked by Rheinstein Castle 1m green, ''25.9.1930'' on board cancellation, green confirmation cachet and the same day Berlin receiver, VF, Sieger #88Ec, Est. $100-$150 (Image)

1931 (April 10-11), Egypt Flight postcard, franked by Castle 1m green, tied by Friedrichshafen ''9.4.31'' date stamp, red confirmation cachet, Cairo ''11.AP.31'' drop and Jerusalem ''13.AP.31'' arrival marking, VF, Sieger #104 var, Est. $150-$200 (Image)

1931 (July 24-27), North Pole Flight cover, franked by Zeppelin POLAR FAHRT 1931 4m black brown, tied by Friedrichshafen ''24.7.31'' ds, red Flight cachet, Ice- Breaker ''Malygin'' drop marking of July 27, VF, Sieger #119, €1,100, Est. $350-$400 (Image)

1931 (July 24-27), North Pole Flight US postcard, franked by Zeppelin POLAR FAHRT 1931 2m ultra, cancelled by Berlin ''25.7.31'' marking, red Flight cachet, Ice-Breaker ''Malygin'' drop marking of July 27, VF, Sieger#119H, €375, Est. $150-$200 (Image)

1931 (July 29-31), North Pole Return Flight postcard (real photo of L.Z.127 in flight), franked by Zeppelin POLAR FAHRT 1931 2m ultra, on board ''29.7.1931'' cancellation, red Flight marking, Leningrad-Berlin connection of July 31 and Berlin ''31.7.31'' arrival ds, VF and scarce, Sieger #119 I, €700, Est. $350-$400 (Image)

1931 (August 29 - September 4), 1st SAF two postcards to Brazil, franked by Zeppelin stamps, first one - by a single of 2m ultra, cancelled on board ''31.8.1931''; the other one - by two of 1m carmine, cancelled by Berlin ''29.8.31'', first with green, the second with green and red Flight markings, each one with Rio de Janeiro ''4.IX.31'' arrival ds, VF, Sieger #124Cb, 124Dc, Est. $150-$200 (Image)

1931 (September 11), Zurich Flight postcard (processing mail on Graf Zeppelin) to Switzerland, franked by North Pole Flight stamp of 1m carmine, on board ''11.9.1931'' cancellation, Mophila Hamburg cachet and pre-print, the same day Zurich arrival ds, VF, Sieger #127B, €125 without a premium for franking, Est. $100-$150 (Image)

1932 (April 4-10), 2nd SA Direct and Return Flights postcard (close view of the cabin of L.Z.127), franked by two stamps, including Zeppelin 1m carmine, on board cancellation, green Flight cachet, upon arrival to Recife (7.IV.32) uprated by three Brazilian adhesives, return Flight violet confirmation marking was applied, Friedrichshafen ''10.4.32'' arrival ds, mostly VF and scarce, Sieger #143C, Est. $150-$200 (Image)

1932 (April 4-13), two postcards of the 2nd SA Direct and Return Flights with German and Brazilian franking, first one franked by two stamps, green Flight marking and Recife (Pernambuco) ''7.IV.32'' arrival ds; the other one - franked by three Brazilian values, bearing black confirmation cachet and Friedrichshafen ''13.4.32'' receiver, mostly VF, Sieger #143, Est. $150-$200 (Image)

1932 (August 29 - September 1), 5th SAF postcard (Hugo Eckener) to Bolivia, franked by three air post stamps, tied by ''30.8.32'' on board marking, violet confirmation cachet and La Paz ''14.SEPT.32'' arrival ds, mounted on page from a Collection, VF, Sieger #171, Est. $100-$150 (Image)