Definição

• Master Die.  A hub, or patrix. A master die is positive (convex) and negative working dies (concave matrix dies) are made from it by hubbing.  See engraving.

  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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