countermark

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countermark

(ˈkaʊntəˌmɑːk)
n
a mark on an object that is additional to a mark already on that object, and that serves a purpose such as enhancing security, or noting a change in the value of that object, etc
References in periodicals archive ?
(54.) The watermark is most similar to those catalogued as Briquet 7210 and Heawood 1721, although the absence of any complete sheets of paper in the repairs prevents the identification of any countermarks. See CM.
The competing countermarks hypothesis: Reliable assessment of competitive ability by potential mates.
More research on the paper used in Ricordi's scores is necessary to discover whether crescent countermarks are present on sheets with the eagle/"GFA" combination, or whether perhaps the eagle and crescent bifolia combinations as illustrated in figure 2 might also contain the letters "GFA" on the bottom half sheets.