The Watch is introduced on the stainless-steel bracelet and is driven from the OMEGA Master Chronometer Calibre 8800, which can be seen in the sapphire-crystal within the wave-edged caseback. To make sure the integrity of our timepieces at depth, not just some but all watches are completely immersed in water https://www.watchesworld.com/the-most-coveted-watches-in-the-uk/