Definizione

• Die Pair.  The two dies employed to strike a particular variety, intended or not. This term is used when cataloging a number of similar varieties of the same type or year. It is employed in contrast to a different variety with two completely different dies, both obverse and reverse.
  Die Retention.  Setting aside dies that are later used for restriking that was not originally intended. This term applies more for coin dies than medal dies which are typically stored for later striking, as for an award program. Storing dies must be done in very controlled conditions and location. The striking surface must not be exposed to moisture, causing, of course, rusting on the surface. Even air can be a source for deterioration. Dies do tend to become brittle over time, so a complete understanding of iron metallurgy, hardness, heat treating, setup and testing for the restriking of these pieces.  See die vault, rusted dies, restrike.
  References:                                                                                                                              CLASS 04.4
  NC10 {1962} Newman and Bressett, p 84-86.
  2420-(051)04.1           Illus: Drawing, Photos Douglas 7,8

  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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