Strike through die cap?

I have been sorting through 50 pounds plus of mostly modern coin for a freind who's dad past away recently. Lots of copper cents and extremely little of anything newer then 2001.

I came across this Roosevelt dime, reverse up and thought it a fire damaged coin until I looked at the obverse.

Could this be struck though a late stage capped die. Any help would be appreciated.

 

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I’m guessing some kind of acid etc..

 

I'm thinking die deterioration. Just a worn die issue.

 

Not a a die cap error by any means. As is it has nothing to do with struck through.

 

Trapped between a fixed and spinning drum for a time damaging one side (with heat) and then circulating for a time.

 

Like this? You can copy this for your reference.
My "hypothesis" as well.