Seiko Prospex Automatic Diver Sea SPB313J1 - reliable, sporty, high quality! Since its founding in 1881, Seiko has been at the forefront of watchmaking innovation. The Prospex Automatic Diver Sea is a testament to that tradition, with its superior craftsmanship and innovative design. The 6R35 caliber automatic movement ensures accuracy to the second per day and offers a power reserve of 70 hours. The stainless steel case has a super hard coating, the unidirectional rotating bezel prevents accidental twisting. The 41mm case is also water-resistant to 200 meters, making it ideal for swimming, snorkeling or diving. The LumiBrite lume on the hands and markers makes them easier to read in poor light conditions. The Seiko Prospex - reliable, sporty, high quality!