Bidspirit auction | Worldwide Air Post Stamps and

Worldwide Air Post Stamps and Postal History - Germany - Zeppelin Flights - 1933 (October 14 - November 2), Chicago (Century of Progress) Round Flight registered cover from Lübz, franked by Zeppelin complete set specially issued for this flight, red triangle flight cachet, hexagonal connection in red, Friedrichshafen arrival ds in green on reverse along with advertising label, mostly VF and scarce complete set franking, Sieger #238D, C.v. €1,425, Est. $600-$700, Scott #C43-45