Who does this Hallmark represent?

I’d like to identify the maker of my silver Zuni earrings by it’s Hallmark. The Hallmark is a bent arrow with a T on one side of the bent arrow, and a C on the other side. Any ideas?
I bought them at a gift shop about 22 years ago for about $70. I would like to know if they were made by an individual, or are they a knockoff from somewhere other than the USA?
Thanks so much.