countermark

Etymology

From counter- + mark.

countermark means A mark or token added to those already existing, as a security or proof. Lexicurio rates it Sui generis — a strength score of 89 out of 100.

noun

A mark or token added to those already existing, as a security or proof.
An artificial cavity made in the teeth of horses that have outgrown their natural mark, to disguise their age.

verb

To apply a countermark to.“to countermark silverware”