What is a Die Variety Coin? What is a Die Variety ?
A die variety is a variation to the normal design to a coin die, usually caused by human error or defects in the preparation or maintenance of the coin dies. Varieties are typically produced on working dies, instead of on the master die.
Typical die varieties include doubled dies (Doubled Die Obverse and/or Doubled Die Reverse; DDO or DDR), re-punched mint marks (RPM’s), Over mint marks (OMM) and re-punched dates (RPD’s), over dates, plus a small number of other minor varieties introduced during the strike of the coin.