Exports to the US started as early as late 1949, but this one looks brand new and is therefore an 80" Series I from 1953.
What is most interesting about this one is that it is an US-spec model! The small rear lights plus the centrally mounted and illuminated reg-plate holder were used due to local regulations.
I don't think the Mexican bureaucrats asked for specific changes, therefore the exports to Mexico obviously came via the USA. For simplicity US-spec were used for all exports to North America.