countermark

American  

[koun-ter-mahrk, koun-ter-mahrk] / ˈkaʊn tərˌmɑrk, ˌkaʊn tərˈmɑrk /

noun

1. Also called counterstamp.  a sign or device stamped on a coin after its minting.

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verb (used with object)

1. to stamp (a coin) with a countermark; counterstamp.

Etymology

Origin of countermark

1495–1505; (noun) < Middle French contremarque, equivalent to contre counter- + marque mark ¹; (v.) < Middle French contremarquer, derivative of contremarque