This Rockshell Mark III Scuba Wristwatch is built to last, including a 200m fluted screw-down crown, 20 ATM water resistance, and a revolving bezel to track dive time. It has luminous hands and indices protected by a sapphire crystal that is scratch-resistant, allowing for reading time even in low light. The watch, which has a 44mm diameter and is offered in three elegant designs, is made of stainless steel and is driven by a Swiss-made Ronda 515 precise quartz movement.