counterstamp

[ noun koun-ter-stamp; verb koun-ter-stamp ]
/ noun ˈkaʊn tərˌstæmp; verb ˈkaʊn tərˈstæmp /

noun

a stamp added to a stamped paper or document as a qualifying mark.
Numismatics. countermark (def. 1).

verb (used with object)

to stamp (a paper or document) already stamped.
Numismatics. countermark (def. 2).

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Origin of counterstamp

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020