This cover was flown on the Graf Zeppelin from Budapest, Hungary to Friedrichshafen, Germany on March 30, 1931. Upon arrival in Friedrichshafen, it received a backstamp dated March 30, 1931. The Hungarian postal administration had a special green cachet applied to all m ail to be dispatched on the return flight. The green cachet had two varieties, five and six windows on the cabin. On this cover, there are six windows on the cabin.
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