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Hi! I have encountered this 84 N.U hallmark on a number of silver items, many of them using niello. In some cases, the mark also has 925 etched on the back. Could you help me understand it?

Hi! Thank you so much for the guidlines! I am now working on uploading the picture using them :)

Hi everyone! I am analyzing a cup with an interesting hallmark: a horse head seen from the side. Have you ever encountered something similar?