Don Willis: This is the only overdate in the $20 Liberty series and is quite scarce. Breen claimed to discover it in 1959 and wrote about it in his Complete Encyclopedia of United States Coins. All of those known share the same die characteristics. PCGS has graded only four coins in MS61 with none finer. When I handled an MS61 in 2006 there seemed to be some question as to whether there really were four different mint state examples or if that number was inflated.
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