Didn't know that. Are they the exact same except for the lettering? And the price, looks like the Mickey's are more money.Good tire, Cooper also makes the same tire under the "Mickey Thompson" brand with Mickey Thompson lettering.
Look better and are more period correct. Mickey Thompson started making performance tires in the 60's and were on a lot of cars before the T/A tire was invented.
https://www.mickeythompsontires.com/street-tires/sportsman-s-t