定義

• Collar Dies.  Coining dies that specially prepared for use with a collar and to be used in a coining press. Collar dies are turned on a lathe to have a neck slightly smaller than the diameter of the struck piece. This allows the dies to enter the aperture or center hole of the collar, forming the coining chamber, strike the piece and then retract. Actually the dies force the blank against the restraining walls of the collar (which forms the edge, smooth or reeded); and one die ejects the struck piece from the collar. Collar dies and coining dies have much the same meaning; they are in contrast to open face dies (box dies in Britain), which are used with no collar at all.  See dies and diemaking.

  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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