The 1901 Pan-American Exposition celebrated the impressive progress America had made in engineering and industry. It ran from May 1 through November 2. Six stamps were issued in conjunction with the fair. They were the first stamps of the twentieth century and the first bi-colored general release since the 1869 Pictorials. A printing error caused a number of prized inverted stamps, including the 1¢ Pan-American stamp. It pictures the steamer City of Alpena. It was mistakenly inverted during its printing…
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US #294a
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