What you have is Die Deterioration and Machine Doubling. No doubled die here. 40% silver Kennedy's were from 1965-1970. Some were only mint set strikes so your best bet for finding them in circulation or at banks is 1965-1968. 1964 was 90% silver. Happy hunting!
-CH27
Collector of U.S. Coins, Varieties, and Colonial Coinage
Best is to look through the last few pages of threads here on CCF to get a better feel for the difference. For me, the steplike nature of the doubling on this coin means MD.
"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
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