Penny Black Philately
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1950-1959
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1950
1950 The 75th Anniversary of American Bankers Association
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green
1950 Samuel Gompers
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purple
1950 The 150th Anniversary of the National Capitol
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pale blue
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green
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violet
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rose
1950 Honoring Railroad Engineers of America
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brown
1950 The 100th Anniversary of Kansas City, Missouri
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violet
1950 Boy Scouts of America
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brown
1950 The 150th Anniversary of Indiana Territory
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greenish blue
1950 The 100th Anniversary of California Statehood
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yellow