Money clip Mark Identification

I got this money clip with a large lot of mostly jewelry at an estate sale recently and I can’t figure out the maker’s mark (or if this is even Native American or made by a Southwest manufacturer). The mark is SB inside of a star. I am not sure yet if this is silver. I’d love any help with this, as the design on the front definitely looks Native American (looks like Navajo):

I couldn’t find anything on the hallmark. The money clip wouldn’t be silver, but the eagle most likely is. I imagine it is a manufacturer, but it still could be Native American handmade. Usually when you see these chip inlay pieces that are genuine they don’t have real stone and just don’t look this good.