hallmarkyoudaoicibaDictYouDict[hallmark 词源字典]
hallmark: [18] The hallmark on a piece of gold, silver or platinum, which allows it to be legally sold, is so called simply because it was originally applied in Goldsmiths’ Hall, the headquarters of the Goldsmiths’ Company (a City livery company), where the London assay office was situated. The building is in Foster Lane, to the northeast of St Paul’s Cathedral in the City of London.
[hallmark etymology, hallmark origin, 英语词源]
hallmark (n.)youdaoicibaDictYouDict
1721, official stamp of purity in gold and silver articles, from Goldsmiths' Hall in London, site of the assay office; see hall + mark (n.1). General sense of "mark of quality" first recorded 1864. As a verb from 1773.