Also, The SafeDive system involves an outer circumstance (on which the outer bezel is mounted) which will allow the ingress and egress of h2o, and an interior situation, that is responsible for shielding the motion. The protrusion at 9:00 residences the coupling gear system linking the internal and outer bezels. https://www.watchesworld.com/frozen-in-time-luxury-watches-for-winter/