Washington quarter error

found this quarter in my change. maybe someone has insight on this. The picture at the top shows a comparison. The quarter to the right is the one in question. The ridges are recessed from the outside edges. I don’t know if it’s a mint error or something else happened to it.

 

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Let's see it's imaginary, or a quadruple struck quarter on a dime planchet.

 

Would you be so kind and show us a photo?

 

No problem I updated the post.

 

Not an error.

 

Acid or swimming pool immersion eats away the copper core more quickly than the cupronickel cladding

 

Welcome to CT. Your quarter is damaged.

 

I would think if that were the case the ridges would be less pronounced, but I don’t know that much. Thanks for the help.

 

Except, it's not.
You can experiment yourself with the theory with quarters and acid.