01 n. The official stamp of the Goldsmiths' Company and other assay offices, in the United Kingdom, on gold and silver articles, attesting their …
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1.
The official stamp of the Goldsmiths' Company and other assay offices, in the United Kingdom, on gold and silver articles, attesting their purity.
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2.
A distinguishing characteristic or characteristics; as, a word or phrase lacks the hall-mark of the best writers.[figuratively]