
USA
This is the first United States stamp to feature the American Flag. From the 1869 Pictorial issue, it also is one of the first United States invert errors, all from that 1869 bicolored set. In this case, the blue, including the flags, was printed upside down in relation to the red eagle and shield.
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
USA
Flags sometimes can be revealing. This stamp was issued on May 10, 1944 to commemorate the 75th anniversary of the first Transcontinental Railroad. It pictures the ceremonial driving of the Golden Spike, connecting the Central Pacific and Union Pacific railroads on May 10, 1869, at Promontory Summit, Utah Territory.
The stamp is based on the attached painting. Information and image at: http://brianbutko.wordpress.com/2009/12/17/utah-railroad-murals-centennial-today/ |
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
USA
This stamp shows General Fremont standing on the highest peak of the Rockies, holding aloft what appears to be a United States flag. This is from an old engraving modified from a wood-cut.
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USA
Flags can be collected as cancellation designs, such as this Flag cancel above.
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
USA
American Flag displayed on historical commemorative stamp depicting Francis Scott Key, who composed The Star-Spangled Banner.
http://en.wikipedia.org/wiki/Francis_Scott_Key
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USA
http://en.wikipedia.org/wiki/Raising_the_Flag_on_Iwo_Jima
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
USA
Betsy Ross commemorative stamp issued in 1952.
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USA, Countries Flag - Poland
Between 1943 and 1944 the United States issued a set of 13 stamps (Sc.909-21) picturing the flags of the Overrun Countries in Europe and Asia.
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USA [click for larger image]
The United States Postal Service is currently releasing a set of 60 stamps showing the flag of each state and territory as well as different versions of the Stars and Stripes. The above next set is scheduled for release on August 11, 2011.
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Epirus
http://en.wikipedia.org/wiki/Northern_Epirus
http://www.flickr.com/photos/massonth/sets/72157622582808197/with/3884466131/
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Portugal
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
USA, 25th Anniversary of the First Moon Landing, 1969
http://en.wikipedia.org/wiki/Apollo_11
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
Canada, Provinces
http://en.wikipedia.org/wiki/Provinces_and_territories_of_Canada
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
Great Britain
On this Great Britain sheetlet, Sc. 1999a-d, we have clockwise from upper left: White ensign, Union Jack flag (the British national flag), Flag of the Chief of the Defense Staff and Jolly Roger.
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
Brazil
http://en.wikipedia.org/wiki/Flag_of_Brazil
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