Tissot Seastar 1000 Professional Powermatic 80 Watch Blue DialThe Tissot Seastar 1000 merges style and performance without compromising either. With its water resistance up to 30 bar (300 m 1000 ft), screw down crown and case back, it is the ultimate watersport watch, now combined with the energy of the Powermatic 80 movement offering up to 80 hours of power reserve when most automatic movements boast around 40 hours. Diameter: 43 mm Up to 80 hours power reserve 316L stainless steel case Ceramic bezel ring Screw