Hard to tell from the photos--a little soft and not showing the full coin. Light source seems to have introduced a rose/salmon-like color. As of now, I'm thinking Die Deterioration coupled with a fair amount of circulation wear.
Looks more like a Struck Through Grease fill on both sides. Like the operator wiped the dies with a cloth, moving all the grease into the outer areas of the dies. (Note the affected areas before they disappear, they get wider as the fill of the devices get totally filled:
If it were DDD, the devices would be normal, then the fields would be affected. I'm not seeing that on this coin.