Vehicle registration plates of Puerto Rico
From Infogalactic: the planetary knowledge core
The U.S. commonwealth of Puerto Rico first required its residents to register their motor vehicles and display license plates in 1912.
Passenger baseplates 1986 to present
In 1956, the U.S. states and Canadian provinces came to an agreement with the Automobile Manufacturers Association that fixed the size for license plates for vehicles, except those for motorcycles, at six inches in height by twelve inches in width, with standardized mounting holes. The 1955 (dated 1956) issue was the first Puerto Rico license plate that complied with these standards.
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