Jefferson nickle error?

It's some form of peripheral die damage. Based on the photos, I would tentatively guess that this is an example of collar clash. A more confident conclusion would require a personal examination.

 

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Thanks for showing up. It has to be something with the collar or curved object due to the curvature. Have you ever seen anything like it? I have not. Nothing even close - ever.

 

I have seen many forms of peripheral die damage that parallel (and sometimes replace) the design rim. Most represent die attrition errors (where a misaligned die has its perimeter ground off from repeated collisions with the collar). Others are not so clear, but some may represent collar clash.

 

When this kind of clash occurs, is it usually a feeder issue? Or, a deterioration issue?

 

It was in my grandfather collection ...

 

Due to later stage die deterioration I have 3 of them and it's common towards the end of a dies life. Cycle

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I'm from Missouri "the show me state." Let's see one.