That was a very helpful thread Darren. I had forgotten about it. I did find the front difference you point out on the two different color backs I have. The Clemente with the darker line under his chin and mark by his ear occurs on my whiter version
I am sure this print defect has shown up here somewhere before. A friend would like to know if our print experts have a theory on how both the white letters and the mark below his lips may have occurred