Denier - Charles II Bergues mint

Charles II — Charles the Bald — inherited the western portion of the Carolingian empire following the Treaty of Verdun in 843, and the subsequent decades saw intense pressure on royal minting authority as local magnates and ecclesiastical institutions asserted control over coin production. Bergues, in present-day northern France near Dunkirk, was a minor mint whose output was modest enough that no Morrison or Gariel reference number has been assigned to this specific type — a telling indicator of rarity in the scholarly record.

Prou 226c places this squarely among the less-documented peripheral issues of the reign.