First, it's not normal. No coin should look like that. Second I believe it's a legitimate mint error, not PMD. Now for the most important part. What is it and what caused it? I'm not an expert. I don't think it's a lamination. Looks more like some type of struck thru. Others will chime here.
Other then that, it's a nice looking coin and very interesting find! !
Proud member of the Black Sheep Squadron!
In Memory Of Those Members Who Left Us Too Soon.....