I don't think it's an RPM or An S/D. If you look at 196 in 1968 you can see it has the same effect going on under the devices. That or it's highlights from the lighting you used. Happy hunting!
-CH27
Collector of U.S. Coins, Varieties, and Colonial Coinage
Keep in mind the way dies devices wear. On the mint mark area, they tend to flow to the rim in a SE direction. So the metal movement your seeing is die wear.
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