Casio G-Shock Gulfman Digital Watch G-9100-1

From G-SHOCK, the watch that delivers the ultimate in modern personal timekeeping comes a GULFMAN model that packs powerful features and functions into a tough rest-resistant configuration. All external metal parts, including screws, back cover, buckle, and even button shafts are made of titanium alloy for total protection, even in seawater environments. The band is secured to the case by milled titanium alloy screws, while the form of the forged titanium alloy back provides outstanding impact resistance. The band is configured so it does not adhere to the wrist when wet. Functions include Tide Graph for current tide conditions at a glance, a Moon Phase Graph for a graphic display of moon phases, and a Dual Illuminator for simultaneous illumination of the display and its periphery.