hall·mark / ˈhôlˌmärk/ •
n. a mark stamped on articles of gold, silver, or platinum in Britain, certifying their standard of purity. ∎ a distinctive feature, esp. one of excellence: the tiny bubbles are the hallmark of fine champagnes.•
v. [tr.] stamp with a hallmark. ∎ designate as distinctive, esp. for excellence.
a mark stamped on articles of gold, silver, or platinum by the British assay offices, certifying their standard of purity. Recorded from the early 18th century, the word refers to Goldsmiths' Hall
in London, where articles were tested and stamped with such a mark.
till you are out of the wood you should not exult until danger and difficulty are past (halloo
means shout in order to attract attention). The saying is recorded from the late 18th century.
Official stamp used by British government assay
offices to mark the standard of gold and silver articles. The mark has four elements: the standard mark, showing the purity of the metal; the office mark, bearing the assay office's cipher; the date mark; and the maker's mark.