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1853-O Liberty Seated Quarter Dollar - Filled Mintmark Reverse
by Greg Johnson
Issue 105 of the Gobrecht Journal featured an article 
  about the 1853-O filled O quarter. I had the good fortune of acquiring a very 
  early die state (pre filled O) that could conclusively be shown to be the same 
  reverse die and wrote a fairly detailed article about it. One of our numismatic 
  colleagues whom I asked for an opinion on an early draft of the article had 
  said it would be nice to show a die progression as the mintmark fills. My response 
  was that it would be great to show such a progression if the coins could be 
  found. Neither he nor I had the necessary coins at the time so no such sequence 
  was shown. Now, two years later, I have acquired additional examples of the 
  die pair and am showing in the figure included with this column six coins with 
  the mintmark in various degrees of deterioration. 
  
  The search that has been ongoing for the past two years has revealed that, though 
  rare, or at least very scarce, the early die state is available from time to 
  time. I think that it is frequently mistaken for the 1-A die pair, which on 
  initial inspection is difficult to distinguish from the early die state of reverse 
  E (which is the filled O reverse in later die states). Three of the earlier 
  die state “filled O” examples acquired over the past two years have 
  been purchased unattributed and at prices that were moderately below sheet.
