Read
about the crowd at the post office on the first day of sale, May 1, 1901
Descriptions below are take from the Exposition's Official Catalog & Guide
 A lake steamer looking toward the port bow; the pilot house is well forward; it is powered by side wheels. |
 Train of four cars drawn by a locomotive with four drivers; four parallel tracks are shown. |
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 The automobile is of the closed coach order with two men on the box; part of the U.S. Capitol is in the background. |
 The largest single span steel bridge in the world is shown; two trolley cars are upon it; a full view of Niagara Falls is seen under, beyond, and up the river with the graceful springing arch as a frame. |
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 The great ship canal locks at Saute Ste. Marie, Michigan, are given in a view from a higher point, including the immediate surroundings. |
 An ocean steamship of the American Line, with two smokestacks and masts, presents its starboard bow lapped by a rising wave. |
Here are other web sites which provide detailed information on this series, which is credited by some with beginning the stamp-collecting hobby in the United States:
Explanations of each of the stamp images above: http://1847usa.com/ByYear/1901.htm
The Buffalo News (3/27/2001) article
on the release of reproduction Pan-American 'error' stamps:
http://panam1901.org/buffnewsarticle.html
The 1901 Buffalo
Evening News Story on how the 'inverts' were discovered:
http://panam1901.org/blunder.html