Minnesota quarter thru grease. Proof 1968-S Cent thru wire. 1901 Quarter Eagle thru debris. 1914 Gold $10 Indian thru debris both sides.
And this has to do with a lamination on reverse But what's going on at Lincoln's face I don't know (last pic.)
Since there is part of the date showing on this cent. I would say this is a unretained lamination. And another lamination.
I thought so too, but there is a crack underneath that crack, and it made me think it should be lamination instead of crack. See the pic.
I am not fully sure on this one. there is zero displaced metal, so I am assuming it is a struck thru of some sort.
Honestly speaking @Pickin and Grinin, I don't know what it is for sure. I still think it's lamination. See the "O" in ONE, it looks like it's detached from the surface.