This 1966 First Day Cover features the United States 5¢ Poland's Millennium stamp, issued to mark the thousandth anniversary of Polish statehood. The cover bears a clear Washington, DC postmark dated July 30, 1966, the official first day of issue, and carries an attractive Art Craft cachet.
The stamp and cachet commemorate the baptism of Prince Mieszko I in 966, an event that established Christianity in Poland and laid the foundation for the Polish nation. The cachet illustrates Prince Mieczyslaw I and his son Boleslaw I, Poland's first king, alongside a map of historic Poland, highlighting the deep cultural and religious roots being celebrated in 1966.
A notable detail is the dual-language design of the stamp itself, with "POLAND'S MILLENNIUM" and the years 966–1966 flanking the crowned white eagle, Poland's national symbol. The Art Craft cachet adds further visual interest with its detailed statues and period map.
This cover makes an appealing addition for collectors of U.S. commemoratives, Polish heritage topicals, or Art Craft cachets, with fresh colors and a crisp postmark that display well in a collection.
