It's not a doubled die nor an RPM. What you are seeing on the date and mint mark is machine doubling. It should bring a few bucks for the clip.
Nothing about coins are easy, I can tell you that! But I love the Hunt! I also Love metal detecting Up and down the Mississippi River were early settlers Use to camp . I have found Hust about anything you can think of.. 4lb canon balls muskets old coins silver, But no gold coins... But find gold rings Under bridges by the river front.. I found a few thing on the grounds of the worlds far till I was told I was not allowed to treasurer Hunt there after six day !