1991 P Lincoln

On the reverse above United States are what looks like each letter scrapped off the top layer or just maybe the positioning caused the strike.I'm not able to explain it to myself, so please explain how this happens.

 

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Hello. It's "Split Plating" doubling.
Search Results split plating (error-ref.com)

 

It also has a ridge ring a sign of die deterioration it won't be a cent anymore soon.

 

Thanks @potty dollar 1878 . Forgot that one. I call it " the ring of Fire" .

 

Nope. The only way you get the ring of fire is after you eat too many habanero peppers…trust me…imo…Spark

 

That's why I don't eat Habaneros anymore. There's not enough ice cream available to be eating Habaneros. That's why I prefer Jalapeños and Serranos.