The Dive Watch Connection

Mystery solved. A chap on another forum pointed out it's the solar panels.

I've noticed multiple SBDJ011s with some odd marks on them... all in the same place. ie: I believe each of these three images is a different watch. The 'ring' around the outside of the dial could be where it draws solar power from (?) but the three lines on the face of the watch... no idea. I did so...