A second mark, stamp, or symbol placed on something (especially a coin or official document) to validate, verify, or indicate a change in status.
From 'counter-' (against or additional) plus 'mark' (from Old English 'mearc', a visible sign or boundary). Numismatic and administrative term dating to medieval times.
Coin collectors love countermarks—ancient coins were stamped with new marks when governments changed or new rulers took power. These marks tell the hidden history of empires and trade routes!
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