Usually appears late in die life and is caused by fatigue around the base of recessed design elements on the die. These areas receive a large amount of friction as the metal flows during the strike. The carbon in the dies steel dissipates and results in the collapse of those areas over a period of time, depending on the quality of the steel used to form the dies. This doubling usually extends all sides of the raised element both sides and all over the die, often both of the die pair are affected.

Dies that clash are routinely polished to remove the damage and make the die usable. Often the polishing will leave a "shelf" around design elements on the die. When these Dies strike coins, they may appear to have elements with extensions and doubling. Concave dies, convex dies and flat dies all take polishing a little differently from each other. The fields of a convex die are not flat - they are curved outward. When these dies are polished it tends to flatten the fields. The base of design elements, numbers and letters in these areas will sometimes appear as doubling and/or added and/or extended design elements on the struck coin.

1962 One Cent -Queen's face
1962 One Cent -2 in date -Erroneously referred to in the past as "Re-cut Date"
1962 One Cent -962 in date -Erroneously referred to in the past as "Swing Re-entry Date"
1965 One Cent -Queen's face
1967 One Cent -Date -Double Date
1979 One Cent -Date -Double Date

1951 Five Cents -Obverse Portrait -Erroneously referred to in the past as "Re-entered Portrait"
1962 Five Cents -2 in date -Erroneously referred to in the past as "Recut Date"
1962 Five Cents -Date -Erroneously referred to in the past as "Re-entered Date"
1963 Five Cents -Back of beaver -Erroneously referred to in the past as "Re-cut"
1967 Five Cents -Date -Double Date
1967 Five Cents -Rabbit
1968 Five Cents -Forehead of beaver
1980 Five Cents -Date -Wide Date

1952 Ten Cents Date -Double Date -Erroneously referred to in the past as "Re-entered Date"
1968 Ten Cents Date -Double Date
1992 Ten Cents Date -Double Date

1996 Two Dollars "Extra Mountain"

• This page contains a partial listing of the over 2,500 Die Deterioration Doubling varieties known to the Canadian Error Coins website.
• This list contains those that have been widely advertised or are well known.
• Some varieties here may have a slight premium value over their regular counterparts of the same date.
• Values for all coins listed here may be derived from dealer advertisements, auction results, coin guides and published trends of Canadian coins. Please do not contact us regarding the value of any coin. Please refer to your local library or bookstore.
• If you have knowledge of any other Canadian coin that should be included in this list,
  Please contact Patrick Glassford.

Page created by: muckwa
Changes last made on: 02/11/04

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The Canadian Error Coins website (est. in 1997 by Patrick Glassford) is a division of the Canadian Numismatic Publishing Institute, established in 1958 by Somer James, publisher of many fine Canadian numismatic publications such as "A GUIDE BOOK OF CANADIAN COINS, CURRENCY & TOKENS" and "CANADIAN SILVER DOLLARS" by Starr Gilmore.