Cents from 1968S-1970S seem to show a lot of machine doubling, which is not "doubled die" type of visual doubling. This is one of my favorite example of machine doubling for them, If only it had been a "Tripled die" Jim P.S>. It is not an S, but I have one similar somewhere !
Maybe i didnt explain it better. If u look at his bowtie he has 3 points if it was struck over the last. I checked it with the proof design it doesnt show that. If you could look at that again because now im really confused if that is suppose to be there.