A hallmark about “TH” needs everyone's help to find out whose it is

My friend bought it from a vintage store in the southwest. But he can’t find out who made it. So he asked me for help, but I still couldn’t find out who it was through “Native American and Southwestern Silver Hallmarks 5th edition.” So I need some help from an experienced player, thank you!
Back hallmark is ”T H“



nothing on TH yet but noticed some other writing by the arrows

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Thank you very much for the answer, Steve. What does some other writing by the arrows means?

If possible, please provide clearer/closeup pics of the writing/marks @Steve pointed out with the red arrows.