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common1945-1980
1956 US 6-cent Air Mail Eagle Indicium
United States · 1956 · 6 cents
A 6-cent United States air mail indicium from 1956, featuring a stylized eagle in flight, likely part of a pre-stamped envelope.
This indicium was used on air mail envelopes in the United States during the mid-1950s, reflecting the growing importance and standardization of airmail services.
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Image: U.S. Post Office Department · License: Public domain
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