In terms of relative rarity, the 1901-O Half Dollar is one of the tougher dates in the series. It is notorious for being weakly struck, especially on the upper right shield and the adjacent feathers on the reverse. This area is opposite Liberty's puffy cheek and mouth, both of which can also show mushy details. As scarce as circulated pieces can be, Mint State 1901-O Half Dollars appear on the market with regular frequency, usually in MS62 to MS63. Gems are very rare. One of the most outstanding examples is the well-pedigreed PCGS MS67+ that was once owned by Dr. Steven Duckor, a recognized specialist in this series.