OK. Maybe it isn't damage just trying to get everyone to think. Do I need to show a full size photo? LOL
I vote strike through. Looking at your photos, I would say it could have been struck through grease, or debris from wear or cleaning of the die. Any "glob" of a foreign substance on the die, will create a strike through.
Following this thread: Do the perceptions of the viewers looking at the digital photo of this coin believe this is mint damage? Just watching?
This member believes it is struck through debris, which is done at the mint during the striking of the coin. There are no signs of raised or displaced metal, only a hole where something was pressed or stamped into the surface of the metal. Had this been done after striking, the weak device in the shallow part of the hole would have been obliterated and signs of metal movement would or should be visible on the face of the coin opposite of the depression.
It's much harder to see in the first photos. But if you look closely there is part of the O visible within the obstructed area. This leaves out a strike thru- This is a loss of lamination - delamination after strike. Once grease is compacted it will not leave details within the affected area.