Hallmark ID on sterling oval conchos, turtle concho

Picked this up at the thrift store today.

Looks like turquoise and sterling. One concho has mark. Any help ID’ing the artist is appreciated!

Maybe looks like a rattlesnake?



The style is Navajo. Don’t think that turquoise stone is real. I just can’t make out the mark. A Navajo silversmith is not going to use a snake for a hallmark, maybe it is something else. If you could attempt another image that might help.

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That’s not a snake. It’s part of a wing, head and tail. I can’t remember where I saw the mark before, though.