On May 25, 1933, two stamps—a green 1-cent and a violet 3-cent—were issued on the occasion of the Century of Progress exhibition in Chicago. The 1-cent stamp depicts the restoration of Fort Dearborn, a pioneer outpost on the site of Chicago; the 3-cent shows the new art deco Federal Building in Chicago.
The stamps were reissued on August 25 in imperforate souvenir-sheet form without gum to mark the convention of the American Philatelic Society.