On the 2nd to last picture I can see what you are talking about in the date. Simple machine doubling. I can see the shelf like appearance in the date,not a true DDO.
Here are two examples of doubling on the 76D Kennedy obverse, MD (Master Die) MDO-001, MD-1-O-II-C (P, D, S, PR) and 76D DDO-001, 1-O-II-C (4). I see no doubling on your half dollar. Larry Nienaber