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countermark

[noun koun-ter-mahrk; verb koun-ter-mahrk]Numismatics
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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.
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Origin of countermark

1495–1505; (noun) < Middle French contremarque, equivalent to contre counter- + marque mark1; (v.) < Middle French contremarquer, derivative of contremarque
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018