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Definition A hallmark is an official stamp on gold, silver and other precious metal articles, impressed by an assay office to attest their standard. History English gold and silver articles have been marked by some form of hallmark since the 13th Century. This duty was originally carried out at Goldsmiths hall in London. Today there are four assay offices in the UK, although there have been several others over the intervening years. Please click here for more information on Assay Offices. Components of a Hallmark Today a hallmark consists of three compulsory marks ("925" standard mark, assay office mark and...