2020 D Jefferon Nickel DDR Or MD?

maybe, but to confirm doubling we'll need better closeups of the suspect areas

There was some images, of a EDS die state on the full images. A great looking OBV and REV. But these are all Single squeeze dies. So to look for a doubled die, the areas to check are in the opposite areas than what your looking at. On the nose area for the DDO and on the central area DDR by the door. Those are the correct areas.
Obverses:



Reverses:




So forget looking at other areas of the design, like the way it used to be done. (save your eyes) Look at the right areas to find them.

CoopHome: Nickel Doubled dies on single squeeze coins

I'm sure there are a lot of the doubled dies that have not been found yet on the single squeeze dies. Halves probably had not been found yet. I'll Check out Wexler pages to see what is found so far. The last listing is 1992 on them. (Just before the single squeeze dies) So there are probably missed so far.

I just found this question, hopefully on the similar topic of Jefferson Errors: 1989 was the last year of the hand-punched mint-marks on US coins.

I am not anything close to an authority, but I did find this quite convincing: "It could have been as early as the later part of 1985 but we can only be sure that at least by 1986 dies were being made via this process. Their statement makes clear that by 1986 the process had been used for master dies, working hubs and was already in "pilot testing for production dies." " Single Squeeze Hubbing

https://conecaonline.org/so-just-wh...bbing-begin/

1986 seems to he the date, but for what coins? Because the 1995 LM, and 2009 Duke Ellington are serious doubling. Also seems alot of mint employees lost there jobs with the robots and new machines cutting back on labor costs.

The date area: note the direction on the affected area? When metal moves towards the direction of the rim, that is DDD. Die Deterioration. Looking at the fields on this coin, it looks like a fresh die, but was recently polished. So die aging is happening. Just like the void created by a chip, the die wear is altering with fields. So when you see the outer devices distorting, then it is DDD. The field polishing hides the die wear, giving the a appearance of a new die. That is what you are seeing. Wrong location for a doubled die.