I have a 1996 Lincoln Memorial Penny that is messed up. The back of the penny has a spider-like design. I think what happened is a bunch of pennies during the minting process, or somewhere along the line, came i n behind the penny and dug a grove into the back of the penny creating the spider-like design.the marks are ramdom looking
It looks like it was placed against an abrasive belt or disk sander while being rotated slowly. The markings look exactly like some brass casting I’ve worked on.