Dated September 30, 1979, this envelope marks a significant moment in the history of the Panama Canal Zone: the final day of the United States' independent postal service there. For 75 years, from 1904 to 1979, the Canal Zone operated as a U.S. territory with its own distinct postal system.
This particular cover, addressed to a philatelist in Pennsylvania, proudly displays a Balboa postmark and a special "LAST DAY OF OPERATION" slogan cancel, clearly indicating the momentous occasion. It’s a tangible representation of a geopolitical shift, signifying the conclusion of an era that began with the monumental construction of the Panama Canal.

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