Identify that Damage! Episode 4: In God We Rust

I've got a couple of coins that have turned a nasty iron oxide-brown. I guess it's missing the clad layer? If not, I'm not sure how this would happen.

 

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Not missing clad, just environmental damage. It could have been caused in millions of ways. Spend them and forget about them.

 

Throw a few coins in the grass and find them a year later. Some will look like this.

 

They each look like environmental damage. I don't see evidence of missing the clad layer (which is a fairly uncommon error).

 

The middle one looks like it was in the rug too long..........

 

Sometimes you make it too easy.

 

Wishing well finds