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Strange janis prow markings and stone

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Hi all. New here, looking for help on this prow coin. Notice the stone on the reverse it is raised and bits of the same stone is in the grooves on the star cut. ANACS says it's copper sulfate but I think there's more to it. The stone is , as you can see, in the middle of the coin, and in the grooves only, odd that if it was copper sulfate it would be threw out the coin??? Can anyone help? Thanks




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