looks like it got struck and peeled back a bit doesn't it ? and that long, deep scratch. great pictures
Could be 2 things.. A Detective Planchet with a Crack then the Lamination occurred. Nice I don't see the crack on the Reverse side.. So I'm thinking it's just a Lamination Crack.
It's a minor Lamination. Something major would be like this example from my collection - Click to enlarge
I have found for the most part when a copper coin is not properly annealed, any raise or dent can cut the protective layer over the outside copper or zinc clad and can start that sort of lamination cancer. It can start black, then go to white and eventually to the popular copper oxidation green before taking over and finishing off anything left on the coins field or elements. A poor strike in later stages of die deterioration can also cause these pox to open up to the environment.
You sure it didn't get mixed in with the potatoes and got attacked by a peeler? ha ha What a superior example of lamination at it worst (best?).....
Sorry but your statement is incorrect. Improperly Annealed does not affect the coin to cause laminations. Also copper coins do not have a layer. These laminations only occur due to improperly mixed alloy or a defective Planchet.