When Edox creates a chronometer timepiece, it means that the movement hosted has successfully undergone the tests of the Official Swiss Chronometer Testing Institute (COSC), based in Switzerland. These movements have a certified precision of -4 / +6 seconds per day. About three times better than a standard Swiss mechanical movement. Suitable for scuba diving The leading manufacturer and specialist for waterproof Swiss Made timepieces. Edox the legendary inventor of the double crown seal technology and the «Water Champion» of the Watch industry. Since the 70’s, Edox has specific quality and technical standards for ensuring the water resistance of diving timepieces. The Double O’ring crown and pusher has been engineered by Edox to allow to increase the resistance to water pressure. Diameter : 42 mm Movement : Chronometer Caliber : Caliber 806 (SW 200 COSC Certified) Functions : Date Water Resistance : 300M | 30ATM Material : Stainless steel Glass : Sapphire with anti-reflective coating on both sides Dial : Blue Case height : 12.5 mm Horn-gap : 20 mm Weight : 153g Features : Edox crown and/or pusher with double O'ring , Luminescent hands and/or indices , Rotating ceramic bezel , Screw-down crown and/or pushers Strap : Metal Gender : Men Limited Edition : 500 pieces