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Assay offices are institutions set up to assay precious metals. This is often done to protect consumers from buying fake items. Upon successful completion of an assay the assay offices typically stamp a hallmark on the item to certify its metallurgical content. Hallmarking first appeared in France, with the Goldsmiths' Statute of 1260 promulgated under Étienne Boileau, Provost of Paris, for King Louis IX.
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