2021 P New Discovery Doubled Die OBV Date And Ust

yup, a little thickening of the devices noted.

I'm not really into errors, so help me out. Is a slight thickening of a few devices enough to declare that is a doubled die coin?

Nice find. A 2121 would definitely be a new discovery.

Hi, A good example of a doubled die that is thick with no notches is the 2009 P professional life WDDO 002. It has a very thick LIBERTY It is hard to see in my pix. but the 2021 P has a notch on the lower left of the 1st 2. Also a very minor notch on the 2nd 2. Did everyone see the Abraham Lincoln Emancipation Proclamation medal strong doubled die REV 45mm 52G on the medal post page? If not it is worth checking out. Thanks, Frank B

So here is where I am still parsing through the subtleties of true doubled die identification. The first two images are of a 2012-D nickel with directional DDD. The images are normalized, but one was taken at a right angle and one was taken upside down. From the side, the deterioration doubling clearly stands out because the light strikes it harshly from west, and photographing E-W catches that edge very clearly. But when I rotated the coin fully upside and photographed with light from south, camera N-S, those deterioration halos almost completely disappear.

In extreme examples, the DDD halo can exhibit notching and a complete ghost structure from the parent device.



The 2022-D nickel above shows a much more subtle deterioration. It looks a lot like "thickening" because of the soft, rounded slope and the way the deterioration is only a sliver and not a giant smear. The DDD is visible on the mint mark, though.

Below is a normalized 2021 from the cent. We can see the egg shape to the 0. But the extended parts seem close to the field. I could easily imagine that the red warmth of copper would smooth a DDD feature, where on a hard gray nickel it really stands out. You can also see some Die Deterioration swelling NW of the 0, in the same direction as the doubling. In images from other angles, the doubling seems to disappear, just like my DDD 2012.

To me, that 2021 cent doesn't look much different than the 2022 nickel. I had understood that true doubling is visible from all camera orientations. If thickness is the criteria, then it seems like we need a thorough explanation of how to distinguish minor DD thickness from true doubling thickness.

Also, since it seems only Class VIII and IX are possible for single squeeze hubbing, I am at a loss to understand which category this example might be.

Hi here is a pic of a 2018 WDDO 002. It is not as thick as the 2121 P I have up. Thanks Frank B

Hi, Or it is a DDO. Thanks for hijacking my post with the nickel pix.

Well, congrats on your find!