Can someone explain what function this serves, with a specific use case outlining a scenario where someone would use the rotating bezel to serve some purpose?
The Seamaster is a diving watch, with a rotating bezel that can be locked in place. The purpose of rotating the bezel is to set the large marker that is normally at the 12 o'clock position while on land to the time at which you enter the water. That way, you can track how many minutes remain until the air in your tank expires, without having to remember what time you descended. Most are uni-directional, so if they are accidentally moved, they rotate clockwise, thereby indicating less time remaining than actual...for safety purposes. Does that make sense?