Help, Need hallmark identification ?

[Jewels5]

Hi, any ideas on who the designer could be of this turquoise ring?
I only see the makers mark stamp, I don’t see a 925 mark.

Thanks so much!

[Jason]

I read the hallmark as a NA and only finding two hallmarks in the books, Ambrose Namoki (Hopi so most likely not his work) and Alton Noriega which I can’t find any examples.

[Steve]

possible MiA ?

[Jewels5]

Thank you for your research and response , I appreciate you

[Jewels5]

I tried that one but so far no luck. I’ll keep digging. Thank you