The cover shows a "First Day of Issue" envelope from Canada, commemorating Jean Talon, the first Intendant of New France.
Jean Talon: was a French statesman and the first Intendant of New France, serving from 1665–1668 and 1670–1672.
As Intendant, he was responsible for justice, public order, and finance in the colony.
He is known for significantly developing the colony's economy, conducting the first census in 1666, encouraging immigration, and fostering various industries and agriculture in New France.
The envelope is a "First Day of Issue" cover, meaning it was officially stamped and postmarked on the first day a particular stamp was issued, in this case, June 13th, 1962.