Of course you'll know that the 9kt mark isn't necessarily a hallmark, but a stamp that can be bought by anyone. I have a couple of gold kt stamps and a '925' and apply them (in fact I've only ever used '925') as appropriate. Only the assay office can apply the hallmark, hence the reason it does act as a guarantee. For a stamped, plated article, yes, it would be misleading to knowingly mark a plated article and potentially a case fraud / deception to sell it knowingly.
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