定義

• Undated.  Without a date expressed on a numismatic or medallic item, or unknown by historical reserach.  See dates and dating, art history.

  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

人际关系