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A countermark is a stamped or punched impression adding elements of design to a coin after it was originally struck. The practice of countermarking coins was widespread throughout antiquity. It was particularly common in the provinces of the Roman Empire. Countermarks were applied to coins for many reasons, including revalidation, revaluation, devaluation, and propaganda. Exactly when and why any individual countermark was applied is often uncertain.
Roman provincial countermarks
Countermarked in late antiquity
Countermarks on Imperial Persian Sigloi
Museum of Countermarked Coins
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