I thought that Rolex still uses Kif on their older calibers and that the Paraflex is only found in the cal. 3135 of the Deepsea SD and the 3155 (3156?) in the Day-Date II. And - as Axel said - in the Prince.

I thought the GMT, Submariners, ... still used the Kif shock protection. Which would make me believe that they did not buy Kif.