The Broken Punch.
The Punch ( Is what is used to press into the coin the Mint mark into the Die ) Can, after a time, wear down and lose definition as well as break.  This give the appearance of an RPM when in reality, it is just a defect. I have added a close up. Take a look.

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Here we have the same 1974 D Eisenhower Dollar Double Die and maybe a New DDO, Notice the reeds ( these are the small ridges on the very edge of the coin ) they are in different placements on each coin, Both coins share the same Doubled Die Obverse & same reverse, follow the line to the Reeds.

  
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