Définition

• Billon. A composition with more base metal alloy than precious metal content. Billon coins are either low value denomination or extensively debased. In cataloging, billon
  is usually spelled out (to distinguish from bronze or brass), however in Italian it is abbreviated M (for mistura).
  CLASS 05.2
   
  0705-(078)05.5 Illus: Color photos
   

La source

• D. Wayne Johnson Encyclopedia of Coin and Medal Technology

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