![Pan-American Union](https://www.istampgallery.com/wp-content/uploads/2017/01/895-Pan-American-Union-founding-United-States-Stamp-1940.jpg)
Pan-American Union
A commemorative postage stamp on the Pan American Union – 50th Anniversary : Issued by United States of America Issued on Apr 14, 1940 The Historic Stamp : The 3¢ stamp marks the 50th anniversary of the Pan–American Union. The organization was formed to
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