It’s a well circulated, corroded Zincoln: PMD. I’m surprised it didn’t disintegrate into a pile of dust before you were able to take a picture of it. This is not an error of any kind. You should know that to learn what true errors are, go to error-ref.com…Spark
The error was the US Mint using copper plated zinc Planchets! They don't fair well when treated harshly as yours clearly shows. I've seen worse
