German Graf Zeppelin September 11-12 1929 Germany flight flown cover with red circular Graf Zeppelin "on Board" cachet. Mail was dropped at 15 locations around Germany without postage or cancellations. Postage was applied & cancelled at the post office nearest the drop location. This cover was dropped at Dusseldorf. Stamps applied & cancelled there. Also has a faint red cachet reading " Mit Luftpost Befordert Hamburg Fuhlsbuettel-Flugplat2 " on front. Some minor creases.
Frost Cat. $300.00.