Found a 2015 D Double Die Jefferson

Perhaps you can stop being such a wisecracker? The simple fact is that these aren't the result of double impressions. They're the result of a slip or a slide resulting in what's tantamount to a smear from only one impression. They're not anywhere near on par with any of the known classes of true doubled dies. All they give one is a false impression of what they are, probably because, who in the hell in their right mind wants to think they're collecting but a smear from one impression?

 

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But wait, surely you aren't implying that the only true doubled dies are the ones that are double struck, which would be the only thing that would differentiate the two.

 

True doubled dies are in the classes of doubled dies, if you now need to know how those are formed.

 

"Tilted" die doubling is in a specific class the same as all doubled dies . They are also errors on the part of the employee running the press, the same as one swinging a hammer 500 years ago. Though they are considered a variety by some, they are errors, simply because their existence is an unintended result.

 

The final impression from the final hubbing, which is out of alignment with the tilted impression from the tilted hubbing, creates the "spread" that's characteristic in this class of doubled die. I don't even know what you're asking, anymore. I don't collect those smeared, single-pressed "doubled dies" you evidently collect, though.

EDIT: In case you hadn't had enough:
http://www.oocities.org/ncadd/Class_VIII_Doubled_Dies.pdf