Clueless

I purchased these today and it is driving me a bit bonkers that I cannot identify the hallmark (looks like tim to me). I would appreciate any thoughts!

They were just polished today, so please disregard the shine. Not sure why it looks like there is a chip out of one of them. Optical illusion created by a dark speck in the stone.

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Not sure these are actually Native American due to the open back. Hallmark is hard to read. Some symbol them i M?

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I thought it looked like a lower case t (with the bottom making a little curl to the right) then i m, so tim, but not sure.
They may well be foreign, but I still like them and since I purchased them at a thrift store for hardly anything, I won’t be disappointed!