What is up with this 1975 D Lincoln cent I found. It has "bumps" or roughness all over both sides. I have seen bubbles due to gas, but mainly on zinc pennies. At first I thought it was environmental damage but when I zoomed in I noticed that you can still see the die lines, and cracks going over and through the bumps. I tried to zoom in a crack on photo #11. -- anyway would like some input Thanks, Mike
