It is neither type of doubling. Die/hub or Machine. I've seen this many times before and not just on quarters. Maybe just a slight die wobble or unequal strike pressure etc. Best bet is to first research and find out what DDO's/DDR's are already on the books for whatever coin/yr. etc. that you have. These should show some pics. of the doubling and other markers/attributes for each particular variety. Easier to rule them out that way if you are not sure about the differences.
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