Crumbling die?

[kurtrr]

Hi again, I found this 64-D Jefferson and then read Mike Diamond's "Collectors' Clearinghouse" in "Coin World" 01/10/26. It has some similarities to the rim damage seen in the CW images between UNUM and the mint mark. Above UNUM is definite PMD but I don't think it would have affected the rim this way.
I'm working on my camera set up. This is the best I can do, for now.
5Cjefferson64DRevRimCrackBottomMacroCropped.jpg 5Cjefferson64DRevRimCrackLeft8OMacroCropped.jpg 5Cjefferson64DRevRimCrackLeftMacroCropped.jpg

[MintErrors]

I an not sure what you mean by a crumbling working die. There is a die that shows crazing and that can be found on the https://error-ref.com website.

What year, mintmark and denomination did the article discuss ?

In my opinion, when it comes to circulated coins, they are subject to all sorts of abuse both intentional and non-intentional. To me, this might be damage from a coin wrapping machine but, its difficult to prove. Rim damage can happen a lot of different ways. They can be used as markers or pick up points if the examiner or attributor look at the area and can determine the issue was done at the mint or, if they see the same exact condition on another preferably uncirculated coin.

I have a photo of a Lincoln cent that is close to falling apart for reference. I will provide a link as soon as i find it.

https://minterrors.org/wp-content/uploads/2022/07/Severe-die-cracks-head.jpg

Dies with any sign of falling apart might show die cracks and decent sized cuds. Personally, I dont see anything on this coin that provides me any evidence of it
"crumbling". I just see a worn coin here.

[kurtrr]

Hi, I'm back.
Thanks for the reply. Your help is greatly appreciated. I'm catching up on four coins that have been gathering dust for quite a while.
Took another look at the nickel under high mag. The light must be better today or my eyes better. Something flattened the inner rim. It's PMD on this coin too.
Mike Diamond was calling "crumbling dies", what I was thinking this was, a form of brittle failure. Basically the die was falling apart at the edge of steep devices like letters and numbers also along the inside edge of the rim. The die was having pieces fall off at the rim gutter on a 2007 cent and on a Netherlands 20 cent piece.