Vehicle registration plates of Prince Edward Island

The Canadian province of Prince Edward Island first required its residents to register their motor vehicles and display licence plates in 1913. Only rear plates have been required since 1976. 
Passenger baseplates.
1919 to 1961.
In 1956, Canada, the United States, and Mexico came to an agreement with the American Association of Motor Vehicle Administrators, the Automobile Manufacturers Association and the National Safety Council that standardized the size for licence plates for vehicles (except those for motorcycles) at in height by in width, with standardized mounting holes. The first Prince Edward Island licence plate that complied with these standards was issued six years beforehand, in 1950.