Country: USA
Issue: 50th Anniversary of the Soo Locks – Great Lakes Transportation
Date of Issue: June 28, 1955
Postmark: First Day Cancellation – Sault Sainte Marie, Michigan – June 28, 1955
Postcard: Colored illustration showing the excursion boat Messenger passing through the Soo Locks alongside a giant freighter, with the caption: “Excursion Boat ‘Messenger’ Locking thru with Giant Freighter, Soo, Mich.”
Justification of Maximum Concordance:
This maximum card from the United States and commemorates the 50th anniversary of the Soo Locks, a vital link for Great Lakes transportation. The stamp, issued on June 28, 1955, depicts a map of the Great Lakes and highlights the importance of the locks for navigation and commerce. The postcard image shows the actual Soo Locks in operation, featuring vessels passing through, which directly relates to the theme of the stamp. The postmark is a first day cancellation from Sault Sainte Marie, Michigan - the location of the locks. Together, the stamp, the postcard image, and the cancellation achieve maximum concordance by uniting subject, location, and commemorative purpose in a single philatelic piece.
Yvert & Tellier: US 596
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