die deterioration doubling, causes ghosting of the letters and numbers. http://www.error-ref.com/die-deterioration-doubling/
+ 2 Google will be your friend concerning research. Purchase a copy of the Red book and visit online sites like @John Burgess mentioned: http://www.error-ref.com and others like: http://varietyvista.com
Die Deterioration doubling. Just kidding. It's worthless doubling. Well.. 1 Cent Suggestion. There is a Error Coins forum.
