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I have a gold brooch with no hallmark but has etched numbers on it, the look like - 712 and 7/10 or 7/16??anyone have any ideas what they mean?many thank x

Hi, Please can someone help me? I have just started selling jewellery but i would like to post to the EU and worldwide but i have checked on the royal mail website and most of the countries say jewellery is prohibited??? Has anyone else had this prob...