Worldwide Rare Stamps and Postal History

1930 (16 Sep) New York to Southampton by S.S. "Europa", First Catapult flight, from there to Friedrichshafen and via Graf Zeppelin to Mannheim, cover franked with 20c Air Post and 50c Regular Issue, tied by cds, with appropriate cachets, transit and arrival pmks, fine and scarce Catapult/Zeppelin combination (this cover should not have been accepted by the U.S. Post Office, since the U.S. government had no arrangement with Germany for the acceptance of mail for the various European trips of the Airship. Similarly, the German Post Office should not have accepted this item without the additional German franking)
Estimate: $500