1933 Graf Zeppelin Century of Progress Flight Cover. This historic airmail cover was flown on the famous "Century of Progress" flight of the Graf Zeppelin to the Chicago World's Fair in 1933. It features the distinctive purple cachet "Dispatched From Akron" depicting the airship over the exposition buildings. The cover is franked with the desirable 50¢ Green "Baby Zeppelin" (Scott #C18), issued specifically for this flight, alongside a 5¢ Blue Kosciuszko commemorative (Scott #734). Both stamps are tied by clear "Akron, Ohio Oct 2 1933" machine cancels. Mailed to Frau Anna Danderer in Augsburg, Germany, the cover was routed via the Zeppelin from Akron to Friedrichshafen. The reverse bears the sender's return address in New York and the green pictorial "Mit Luftschiff Graf Zeppelin Befördert" arrival cachet, along with a Friedrichshafen (Bodensee) circular date stamp from November 2, 1933.