In 1769, St. John Island (later known as Prince Edward Island) became a separate colony from Nova Scotia. Charlottetown was appointed the capital of the colony. Canada Post Office issued a stamp commemorating the 200th anniversary of Charlottetown's status as capial on July 15, 1969.
National Archives of Canada
First Day Covers
Canada Post Office Publicity First Day Cover
The Canada Games stamp was issued on the same day.
Shering
Canada Envelope Company
Artopages
Ellliot-Marion
Rosecraft
Cole Cover
H & E
Jackson
Usages
Domestic Letter
Toronto local mail, January 5, 1970
6 cents domestic letter rate