Please help me find out this hallmark on turquoise bolo tie.

Identifying & Discovering
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IMG_20200307_173402
IMG_20200307_1734023456×3456 1.34 MB

Thank you very much.

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Welcome to the forum. What do you see? a NN? Could you please also provide an image of the front? Is that hole above the hallmark in the clasp or actual silver of the bolo?