Omega Men's 2561.80.00 Seamaster 300M Midsize Quartz Watch Precise Swiss-Quartz movement Domed, anti-reflective scratch-resistant sapphire crystal Case diameter: 36.25 mm Stainless-steel case; Blue dial; Date function Water resistant to 990 feet (300 M):suitable for scuba diving to a depth of 30 meters for up to 2 hours