Although I have seen 10, I don’t know who it is connected to. Perhaps other readers of this blog have more information on 10. Your pendant looks like something from the Fred Harvey era, perhaps Bell Trading.
Here is some general information
UITA is the stamp of United Indian Traders Association, which was formed in 1931 for the express purpose of authenticating Native American Indian crafts.
According to Hallmarks of the Southwest by Barton Wright