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The U. S. Post Office Department issued a special fifty-cent Air Mail postage stamp, ( C-18 ) to commemorate the visit of the German airship depicting the Federal Building in Chicago, the Graf Zeppelin in flight, and its home hangar in Friedrichshafen, Germany.
This stamp is informally known as the Baby Zep to distinguish it from the much more valuable 1930 Zeppelin issues ( C13 – 15 ).
Separate from this issue, for the Fair the Post Office also printed 1 and 3 cent commemorative postage stamps, showing respectively Fort Dearborn and the modernistic Federal Building.
These were also printed in separate souvenir sheets as imperforated blocks of 25 ( catalog listings 728 – 31 ).
In 1935 the sheets were reprinted ( Scott 766-67 ).

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