Day 2 parts discussion

[black69]

from a day 2 parts perspective, I have a chance to buy some 15 x 12 cragars to go on my challenger. They have mickey thompson indy profile n50s on them which match what used to be on the car.

Any guess on tire age?: dot code is CY6ETA35290

I read that the last digit is likely the year, but they could be 70 or 80 vintage, or even 90?

also, how do you really tell old cragars from newer ones? I am assuming the chrome plating back in the day was better than what you get today.