Why is important? If a unidirectional bezel is knocked and unintentionally moved over a dive, it may possibly only display an extended underwater time. That means the wearer will overestimate rather then undervalue immersion time, As well as in scenarios that call for decompression stops, This may be a make-it-or-split-it https://www.watchesworld.com/frozen-in-time-luxury-watches-for-winter/