The 46mm wide case (by 17mm thick) is done in Staybrite 1.4435 NCu steel that is higher quality than 316L stainless steel used on most steel watches. Rolex Sea Dweller watches watches (especially the Deep Sea) use Staybrite steel as well. It might be the same formulation. Why is it over 316L? Because this type of steel has a special resistance to the corrosive and discoloring effects of salt water - which is nasty stuff. Just live on a coast and see what water does to thing that are exposed to it for long enough. Caseback of the watch is not screwed down, but instead has a thick sapphire crystal as the caseback which is specially sealed using a unique gasket. It is not user removable, but needs to be taken into be opened up. Angular Momentum says this style of caseback offers superior water resistant security than a screw down caseback. Plus the caseback will remain water resistant after other types of casebacks on diver watches need maintenance to ensure resistant to water seeping in. The crystal comes in different colors (all lume actually so they glow brightly), or it can be ordered to be transparent for a view into the automatic Swiss movement.
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