Improper annealing

I'm not sure could be PMD never seen nothing like this

 

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It also weighs 5.5 grams

 

A metal detected clad coin that was buried in a harsh environment such as soil loaded with fertilizer could affect the cupronickel
IMHO

 

I'll throw an image of the rim out there

 

Metal detector find.

 

I'd say PMD rather then lamination error... just my opinion...

 

It is really too crusty in the photo.
Where did you get it?

 

my wife's change

 

Corroded Surfaces
aka: Environmentally Damaged