1963 that looks like 64-66

[Clyde65]

I was always under the impression that the summer months were retooling time for the auto manufacturers, this is why new models came out in September. I was told that May-June was the latest the current year rolled out of the assembly plant.

I used to wok at a dealer in the 80's and when they sold an 84 Brigadier in June of 1985, it was still an 84, the factory warranty started when it was sold up to 18K miles but it was titled as an 84.