This generation of Datejust watches retained the 36mm case diameter of its predecessors; however it was marked by a number of subtle design updates that accompanied the new generation of movement. While the crystals on the 160xx generation of Datejust watches are still made from acrylic, the sloped “pie pan” style dial from the previous generation is gone, and replaced by one with a completely flat surface, much like the dials that Rolex still uses today. more