Similarly, The SafeDive program entails an outer situation (on which the outer bezel is mounted) which will allow the ingress and egress of h2o, and an internal situation, that is answerable for shielding the movement. The protrusion at 9:00 houses the coupling gear system linking the internal and outer bezels. https://www.watchesworld.com/frozen-in-time-luxury-watches-for-winter/