Maybe already discussed? Could the 1951 default model year given to the Simca 9 Aronde be wrong?
According to Wikipedia, and confirmed at least here (fr),
The first Aronde debuted in the spring of 1951 but initially only a few hundred pre-production cars were distributed to carefully selected "guinea-pig" buyers, and the full production version was finalised only in time for the Paris Motor Show, becoming available for sale in October 1951.

Doesn't it mean that the 1952 MY would be more accurate?