Large lot of jewelry- need help

I just acquired a large lot of jewelry and love the research part of this when I buy these lots but I am very unfamiliar with Native American jewelry. This symbol seen on this ring only has what seems to be a thunderbird and it is seen in numerous pieces with no sterling mark. They have been tested and are sterling. Can anybody help identify this? Much appreciated - I’m interested in selling these. Any help is appreciated

Don’t recognize the hallmark but this looks like an imported, manufactured designed to imitate NA jewelry.

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Thank you for your response