PCGS 1946 Iowa CAC Old Commem Half Dollar 50c Graded ms66 By PCGS. The Iowa Commemorative marks the Final Run of the Old US Commemorative Program. The Iowa and the Booker T. Washington were approved on the same day by President Truman and mark an End to the Program. When looking at an Iowa Commemorative, check for signs of wear on the Eagle’s Neck and Head, and on the Building’s Central Pillars.