This is a Dutch Silver Oval Baby's Napkin Ring. It is hallmarked with " M2 / Key / SL* / Minerva Head. It measures 4" around, 3/4' high and measures 1 1/2" x 1' across the opening. So it is guaranteed to be at least .833 silver fineness, it could have a silver content up to .925. ( 83.5 % silver content)
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