Noun
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.
Source: Webster's dictionaryStyle... the very hall-mark of great art... there is little use in trying to define style. Ernest Flagg
The hall-mark of American humour is its pose of illiteracy. Ronald Knox
It is pre-eminently among the ancient Hebrews that Prophecy is found, not as an accidental or temporary phenomenon, but continuously through many generations. Prophecy is, as it were, the hall-mark of the Hebrew national spirit. Ahad Ha'am
Reputation is a hall-mark it can remove doubt from pure silver, and it can also make the plated article pass for pure. Mark Twain
Just make up your mind at the very outset that your work is going to stand for quality... that you are going to stamp a superior quality upon everything that goes out of your hands, that whatever you do shall bear the hall-mark of excellence. Orison Swett Marden