I've had this Gen. 1 OS chronograph for several years now and I've always liked the way the 2-tone dial can look quite different depending on the lighting (from having the silver and white looking almost as one color to a very dramatic difference between light and dark).
But I had never noticed that the white, outside ring, and the sub-dials have matching circular ridges to them.
(this is what I normally see when I look at the watch):
This is what I discover when playing with my watch :
(You can see the ridges in the sub-dial at up at the 12 o'clock position near the "60")
Have a great day everybody, from a person that loves the details!