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http://www.romancoins.info/Countermarks-start.html

Museum of Countermarks on Roman Coins
We look forward to discussions with interested visitors of these pages and appreciate scans of Roman countermarks to be added to the museum.

Please contact Andreas Pangerl under romancoins.info @yahoo.com (please leave out the blank between our name and the @, this is to discourage spam robots) if you have any questions or need help with the attribution of countermarks in your collection.