Readable, reliable, robust: The Tissot Seastar 1000 merges style and performance without compromising either. With water resistance of up to 30 bar (300 m/1000 ft), screw-down crown and case back, it is our ultimate sports watch. The screw-down crown also offers additional protection against knocks. This latest model harnesses the energy of the awesome Powermatic 80 movement with its impressive extended power reserve.