The Mason Co. (Chicago, IL) owned the hub mold, and hot stamped the vast majority of those chips. The Mason order cards for most hub mold not stamp chips still exist, and are often posted on the ChipGuide in many cases with chips posted there. The Gaming Table (5th Ed., 2017) also list most Mason order card records, but your chip is not included there for some reason. There are records for hub mold chips with a T in a circle, diamond, horseshoe, wreath, and other items, but not a T in a hat. The order card may have been lost, but maybe just overlooked when compiling the 5th Ed.

I would advise that you submit an image of your chip to the ChipGuide, as a UFC chip, and overtime a ChipGuide administrator might be able to find the order card for it, and solve the mystery.