1930 Graf Zeppelins #C13-C15

1930 Graf Zeppelin Issues #C13-C15
To coincide with the Graf Zeppelin’s historic 1930 round-trip transatlantic flight from Germany to America, the Post Office released these beautifully-engraved stamps for mail carried within the U.S. and back to Europe. The limited issues that survived make the Graf Zeppelin set an acquisition of unsurpassed value and significance.