Hall-Mark
From BiblePortal Wikipedia
Webster's Dictionary [1]
(n.) The official stamp of the Goldsmiths' Company and other assay offices, in the United Kingdom, on gold and silver articles, attesting their purity. Also used figuratively; - as, a word or phrase lacks the hall-mark of the best writers.
The Nuttall Encyclopedia [2]
An official mark or attestation of the genuineness of gold and silver articles.
