定義

• Countermark.  Letters, symbols, devices, figures, or their combinations, punched into the face of a numismatic or medallic item to slightly alter its use; a counterstamp.
  Coins are sometimes counterstamped to extend the validity of the piece in time or region.  See counterstamped, counterstamping.

  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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