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Could you elaborate on the significance of the number 999 when found on a silver coin? I've often encountered this marking but have never fully understood its meaning. Is it a purity mark? A symbol of some sort? Or does it represent a particular weight or value? Any clarification on the significance of this numeral on silver coins would be greatly appreciated. It's a mystery that I've been wanting to solve for quite some time, and I'm eager to learn more about it.
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