CASE WIDTH Diameter 44mm, 17.1mm thick, 51.9mm lug to lug, brushed & polished steel case. BACK Brushed steel, 3.8mm thick. CRYSTAL Sapphire crystal, 4.5mm thick with anti-reflective coating. WATER-RESISTANCE 1000 meters (helium escape valve at 9 o'clock). MOVEMENT Seiko NH70 automatic movement, 24 jewels, power reserve 41 hours. FUNCTIONS Hours, minutes & seconds (Open Heart + Skeleton). BEZEL Brushed & polished finishing steel with black ceramic insert. Anti-clockwise rotating bezel with diving scale. CROWN Brushed & polished finishing steel. DIAL Black skeleton with lume hour markers. STRAP Brushed finishing 21mm steel bracelet.