.
I thought the initial Classics were 52mm and the AF1 were 53mm tall, but when comparing them to other trucks and each other, they seem about the same - Thunder cast are a touch lower, Venture cast are a touch taller, Indy cast way taller.
That makes them between 52 and 53 as initially listed, not the current charts.
Interesting either way, but not something I would really get too hung up on.
Those size / height charts are pretty funny though.