This professional diver’s model features Caliber 9S85 which has a precision of +5 to -3 a day. It is built to resist pressures encountered in saturation diving, down to a depth of 600 meters. The groove on the rotating bezel ensures a firm grip even with thick diving gloves. Luminous markers at Each and every ten second point on the dial ensure the legibility on which the safety of the deep sea diver depends Each and every component is built to last, but all divers know that their watch needs regular maintenance, just like Each and every other device on which his or her life may depend. That is why the case, stem and crown are designed for protected servicing and even the bezel has a four-part design that makes for simple disassembly and re-assembly. The dial is made of pure iron in order to give protection to the movement from the harmful effects of magnetism. It delivers protected and protected use all over diving and thanks to the lightness of the titanium, Each and every-day usability may be assured. It has the distinctive clean edges and distortion-free mirror surfaces that only Zaratsu polishing can deliver. It comes with an extra-strength silicone strap, in the deep Grand Seiko so to change the appearance of the watch at will.