Hallmark help needed on Sterling Turquoise Cuff

Bought this sterling cuff at a charity shop in Tucson, AZ. Marked Sterling and “BS” (maybe). Any idea on the artist? Age?
The stone is very green with brown. I took it to a couple of jewelry shops in Bisbee who both suggested it was Navajo with Royston turquoise. Thoughts?



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I would have guessed Navajo, possibly Royston. However, we never really know what mine turquoise is from without actual provenance. Seems like King’s Manassa and Pilot Mountain also can look like that. Sorry, couldn’t find that hallmark.

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Pretty Cuff! Could it be Ben Shiley?

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