The mark, or variations of it, we have seen several times on the forum. I think it probably one of the meaningless ones, used by a manufacturer in supplying the wholesale trade where the customer does not want the origin to be known, thus ensuring that the repeat business goes via themselves and not directly to the manufacturer.
Plater's would mark items with anything the customer requested if the order was large enough.
In your case the 'NS' likely stands for 'Nickel Silver'.
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