Why is that significant? If a unidirectional bezel is knocked and accidentally moved on the dive, it could only Display screen a longer underwater time. That means the wearer will overestimate rather then underestimate immersion time, and in circumstances that have to have decompression stops, this can be a make-it-or-break-it https://www.watchesworld.com/frozen-in-time-luxury-watches-for-winter/