My '73 had the original date coded wheel, but a 1976 Firestone tire. Look what I bought off e-bay, an original 11/72 wheel and tire combo. The tire still has colored ink on the tread and the little rubber nibs. There's absolutely no dry rot and it really looks like a brand new tire. I guess it must have been removed from the donor and stored in a perfect environment all these years.
Wheel is K-1-2 11 21 AZ which is 11/21/72.
Tire is VDU5 FNJ472 which is 3rd week of November 1972.
Wheel is K-1-2 11 21 AZ which is 11/21/72.
Tire is VDU5 FNJ472 which is 3rd week of November 1972.

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