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Assay Office

noun
🔊/əˈseɪ ɒfɪs/
🔊/əˈseɪ ɑːfɪs/
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  1. (in the UK) any of the offices where gold, silver and platinum are tested and given hallmarks (= small marks showing the quality of the metal). There are four such offices in Britain: in London, Birmingham, Sheffield and Edinburgh.