定義

• Alteration.  To change for reuse; as die retooling. A typical form of alteration is correcting a die in some aspect of design or lettering so it may be placed back into production.  Most common is to update to a current year's date, or perhaps to change the lettering when an organization changes its name, or, particularly for coins, to correct a blundered die. Altering an already struck medal is not considered an alteration (it is a form of chasing, counterstamping, or updating). See die retooling, re-engraving.
              Altering a coin once it is struck is considered fraudulent, and is termed altered.
  Altering a medal or decoration is likewise fraudulent but can take more than just a change of the item’s surface. Alteration of existing numismatic items is done to increase its importance or collector value.

  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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