Earrings cast with M mark

Picked up these at a yard sale and after cleaning have been unable to match to a maker so I’m turning to this wonderful group for help!

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Just a bump, Can anyone remember seeing this style in native American?

I want to say I have seen this mark before. It is interesting that it has cast on there, makes me think this mark is for a manufacturer.

Thanks Jason, the search continues :grinning: