Likewise, The SafeDive procedure entails an outer case (on which the outer bezel is mounted) which allows the ingress and egress of h2o, and an internal situation, which can be liable for shielding the movement. The protrusion at 9:00 houses the coupling gear mechanism linking the internal and outer bezels. https://www.watchesworld.com/frozen-in-time-luxury-watches-for-winter/