President Hindneburg and Presidential palace RPPC flown on the Graf Zeppelin's 1931 Polarfahrt / Polar Flight to Leningrad. Franked with Mi457-8, the 2-4M Zeppelin stamps overprinted Polarfahrt, which catalog EUR1360 on cover. With Luftschiff Bordpost / on-board cancels. Slighlty worn, a little toning from mounting reverse. Very nice cover sent to Wien / Vienna.
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