I can’t find a hallmark… I did find hand etched letters not in chronological order on the back visible with a loupe!
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Could the letters be the “traders” code? Pretty necklace 
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I’m clueless… possibly markings for design layout? 
You have some amazing pieces! What’s cool is that to me the squash blossoms look they are in the shape of an animal paw (although with not enough toes 
).
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Yes I agree… my daughter and I both said the same thing. We always look at things seeking hidden shapes, objects in the flow of things. Specially clouds:)
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