Interesting question you are posing. With a few notable exceptions (e.g. the "micro S"), I thought that the mm punch was pretty standard in size and it was the choosing of the location on the die that was done by hand.
"If you climb a good tree, you get a push." -----Ghanaian proverb
"The danger we all now face is distinguishing between what is authentic and what is performed." -----King Adz
I have noticed for many years now that 1978 D has small and large sized mint marks. Did some research a long time ago on it and found nothing. I still keep the ones that are in really nice condition though,never know. John1
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