1955 Poor man's Doubled Die
      
      The 1955 "Poor man's Doubled Die" is actually not a Doubled Die at all.  The doubling that appears on the last 5 
of the date was caused by die deterioration.  When die are overused, they begin erode.  This is called Die 
Deterioration Doubling.   Not only is this very common, but this same type of effect can be seen on other dates 
like 1953.  The 1955 Poor man's doubled die is popular because dealers made it popular.  Some grading 
companies actually certify this variety.