Equipped with the COSC-certified high-performance caliber 8605 movement, this authentic diver's watch is water resistant to 600 meters. The Co-Axial escapement mechanism minimizes the burden on the heart, which vibrates at tens of thousands of beats per hour, and the helium escape valve at the 10 o'clock position makes this watch a highly functional gem. The case is made of titanium, making this model lighter than it appears.