Définition

• Plug Blank.  The center blank that fits within one or more ring blanks to form a bimetallic (or trimetallic) item. The plug blank is inserted within the ring blank before the item is struck. Plug blanks are made with normal blanking technology; ring blanks must form the center hole aperture with close tolerances to allow insertion of the plug blank. They are in a metal in contrasting color to the one or more ring blanks for greatest visual effects in a bimetallic or trimetallic struck item.

  excerpted with permission from

  An Encyclopedia of Coin and Medal Technology

  For Artists, Makers, Collectors and Curators

  COMPILED AND WRITTEN BY D. WAYNE JOHNSON

  Roger W. Burdette, Editor

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