The Seiko Prospex Heritage Turtle Watch SPB317J1 combines a 41mm round-shaped stainless steel case with a super hard coating and a black silicone strap with a traditional buckle. It has a black analogue dial with luminescent hands and indexes. The date display is visible between positions four and five with a round border, protected beneath scratch-resistant curved sapphire crystal glass. Power is generated by the automatic and manual winding movement with an approximate power reserve of 70 hours. This model also has a water resistance of up to 200 metres. Prospex Heritage Turtle 1968 Re-interpretation This watch shape is nicknamed by Seiko fans as a ‘turtle’ - its silhouette, side view and watch case back resemble a turtle with its curved comfortable shell. To divers, sea turtles are symbols of good fortune. Prospex is a combination of the words 'Professional' and 'Specifications.' Seiko Prospex timepieces are designed to be practical, reliable and durable; to meet the high standards required in extreme environments for sports lovers and adventure seekers alike.