Bidspirit auction | Worldwide Air Post Stamps and

Worldwide Air Post Stamps and Postal History - United States - Zeppelin Flight - 1933 (October 5 - November 2), Century of Progress (Chicago Exposition) Round Flight cover, franked by five stamps, including ''Baby Zeppelin'' 50c green in block of four, posted in the mail at Sea Post Office of S.S. Bremen, green Catapult Flight marking, red German Zeppelin Flight cachet, Friedrichshafen arrival ''2.11.33'' ds on reverse, VF and not mentioned in the Cat. combination of Catapult and Zeppelin Flights, Est. $600-$700, Scott #C18