The 4-cent St. Lawrence Seaway Opening commemorative stamp was issued through the Massena, New York, post office on June 26, 1959. A stamp identical in design except for differences in the caption and denomination was released simultaneously, in Ottawa, Canada. The Canadian stamp was in the 5-cent value. Reproduced on the stamp are the emblems of both nations — the maple leaf for Canada and the eagle for the United States — enclosed in interlocking links and superimposed over a backdrop of the Great Lakes. Across the top of the stamp is the wording "St. Lawrence Seaway" and across the bottom "United States." To the left of the design is the lettering "Postage" arranged vertically, and the denomination "4c" appears in the lower right corner of the stamp.
Designed by Arnold Copeland, Ervine Metzl, William H. Buckley and Gerald Trottier, this stamp was printed on the Giori press and issued in panes of fifty stamps each. An initial printing of 120 million stamps was authorized.
Postal Bulletin (May 7, 1959)