Tadams said

If memory serves me correctly, the cars were built obviously prior to the release date. The 1965 cars went on display in September of 1964. At that time most of the cars were released at the basic same time. I was just a kid then but remember my dad would go around the different dealerships to see the new cars.
Unlike today when the cars are released any time of the year.
That might explain the build date question

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