2006 South Dakota S Clad Proof State Quarter PR-69 PCGS 2006 S Clad Proof South Dakota State Quarter PCGS State Flag Label Holder Certified by PCGS PR 69 DCAM, Serial Numbers will Vary 40th State Quarter Issued by U.S.Mint The Reverse side features an image of the State bird, a Chinese ring-necked pheasant, in flight above a depiction of the Mount Rushmore National Monument. Mount Rushmore National Monument featuring the faces of four American Presidents: George Washington, Thomas Jefferson, Theodore Roosevelt and Abraham Lincoln.