Let me first apologize... I try to refrain from posting these (largely because I feel like I would know a double die if I saw one...) But, I decided to check out some of the coins in old folders I'd bought over the years to see if I'd get lucky and find a RPM, OPM or perhaps even a DD. I'm likely just going cross-eyed at this point, but this seems odd for mechanical doubling to me. Thoughts on this 1954 P Jefferson?
That's Die Deterioration Worthless doubling. And the correct numismatic terminology is Doubled Die.. Not double die
I didn't really think it was doubling, was just puzzled by the flat inner circle on the 9 and couldn't think of a better way to phrase it.