Counter-mark

n. 1. A mark or token added to those already existing, in order to afford security or proof, as a mark added to others on a bale of goods to settle its ownership; a mark added to that of an artificer of gold or silver work by the Goldsmiths' Company of London, to attest the standard quality of the gold or silver; a mark added to a medal, some time after it is struck, to show its change of value. 2. (Far.) An artificial cavity made in the teeth of horses that have outgrown their natural mark, to disguise their age.