Bidspirit auction | Worldwide Air Post Stamps and

Worldwide Air Post Stamps and Postal History - Germany - Zeppelin Flight - 1933, Chicago (Century of Progress) Round Flight registered cover, franked by complete set of ''CHICAGOFAHRT'' overprints, tied by Bonn ''11.10.33'' ds, Friedrichshafen ''14.10.33'' connection and red confirmation cachet, special arrival marking ''2.11.33'' in green on reverse, slight traces of mounts, otherwise VF, Scott C.v. $755 for used set, Sieger #238D, C.v. €1,425, Est. $600-$700, Scott #C40-42