The ultimate diving chronograph watch rated to withstand pressure at 500m The Axion Ocean Commander chronograph watch feels good above or below the sea. The large 44mm case gives clear information on the most important of dive requirements, TIMING. Powered by an ETA 2824 automatic movement the Ocean Commander is constructed in 316L stainless steel case and has a scratch-resistant sapphire crystal. Waterproof to 1640 ft and with a helium escape valve we think the watch is not only to be worn by professionals but by anybody with an affinity to the sea. Movement ETA 2824 11 ½’’’ Diameter of movement 25.6mm Height of movement 4.6mm Hours, minutes, sweep second Self winding mechanism with ball bearing Date, corrector Stop second device Regulator system ETACHRON and regulator corrector 28.800 vibrations per hour: 4 Hz 25 Jewels Autonomy of 48h Divergence +/- 0-20 sec Case/Watch specifications: All 316-L stainless steel case Diameter 44mm Thickness of 14mm Ceramic bezel Scratch proof sapphire glass Screw case back 50 ATM water resistant Helium gas valve Solid 5-link metal bracelet with solid foldable clasp Dial and hand description according to each version