1929 (April 23-25), Mediterranean Sea Flight two postcards to Chicago, each one franked by Eagle 1m, both with on board ''22.4.1929'' ds, red flight marking, first one dropped at Seville ''25.ABR.29'', the other one at San Remo ''25.4.29'', Chicago arrivals on May 8, mostly VF, Sieger #24 var, Seville drop is not listed, Frost #127-19D, H, C.v. $650 (Image)

1929 (September 26), 1st Switzerland Flight cover, franked by five Eagle stamps of 5pf-50pf, on-board ''26.9.1929'' cancellation, Bern the same day arrival ds, VF and scarce, Sieger #35h, €350 w/o a premium for franking, Frost #127-31 I, C.v. $450 (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 (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 is alongside, Vaduz ''19.VIII.30'' arrival ds, VF and scarce, Sieger#79B, €600 (Image)

1931 (July 24-27), North Pole Flight US postcard, franked by Zeppelin Polar Fahrt 1931 2m ultra, cancelled by Berlin ''25.7.31'' date stamp, red Flight cachet, Ice-Breaker ''Malygin'' drop marking of July 27, VF, Sieger #119H, C.v. €375 (Image)

1932 (April 4-13), two postcards of the 2nd SA Direct and Return Flights with German and Brazilian franking, first one bearing two German stamps, green Flight cachet and Recife (Pernambuco) ''7.IV.32'' arrival ds; the other one - ranked by three Brazilian values, black confirmation cachet and Friedrichshafen ''13.4.32'' receiver, mostly VF, Sieger #143, Est. $200-$250 (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. $150-$200 (Image)