金银纯度印记：打在金银件上，表明符合法定标准的符号或符号组。
Hallmark: Symbol stamped on an item of silver or gold to indicate that it conforms to legal standards of purity.
大不列颠从1300年开始便采用金银纯度印记；金或银要通过纯度试验和打上国王标记后才得以出售。
Hallmarking in Britain dates from 1300; no gold or silver could be sold until tested for purity and struck with the king's mark.
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