hallmark

US /ˈhɑːl.mɑːrk/
UK /ˈhɑːl.mɑːrk/
1.

segno distintivo

a mark stamped on articles of gold, silver, or platinum in Britain, certifying their standard of purity.

1.

segno distintivo

stamp with a hallmark.

:
he was reprimanded for not hallmarking his work