Hoping to identify hallmark, origin, age of belt buckle, authentic stones, Native American or not

Appreciate any help in identifying maker of what seems to be an older belt buckle. Looks like coral and hopefully real turquoise (what mine?) first thought maybe Navajo but seems like a snake hallmark, not stamped sterling but supposedly tested as such. Whatever information and assessment as to age and value would be appreciated. Searched high and low and just can’t match anything to it. Caught my eye in a shop, reminded me of Albert Nells but I know it isn’t. Hope someone may have a thought - thanks

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Maybe research Lewis Lomay?