Redbook states that most of these issues were sold in the Hawkeye State. They did indeed sell out rather quickley. My son-in-law (Iowa Born and raised) says that he remembers seeing many of these coins as a young lad. There's probably a lot of these coins still in closets and top shelf dresser drawers.....
This is why I don't try to grade coins. I'm Clueless. But regardless of the grade, I really like the coins. High 5 Green.