I have a 1968 D Kennedy with what looks like indirect transfer. But, I can't place the source. See the attached photos and the raised portions above the head.
Do you mean Progressive Indirect Design Transfer or something else? Here's what PIDT looks like: http://www.error-ref.com/progressive-indirect-design-transfer/
No, I don't think it is PIDT. That's why I said unknown. I don't see how the condition could be an image transfer. Thanks for the feedback.
Die deterioration, same kind of deterioration that gives us the ridge frequently seen on zinc cents running through IGWT.