Seiko Prospex challenges every limit, with a collection of timepieces for sports lovers and adventure seekers whether in the water, in the sky or on land. Since launching Japan's first diver's watch in 1965, Seiko's innovative technology has changed global standards. Seiko is constantly striving to bring ever greater reliability and safety to both professional and recreational divers.From the first diver's watch released in 1965, Seiko has been exceeding expectations for divers with its innovative technology. A timepiece that guides you through the challenges in the deep blue. Prospex "Turtle" Black Dial, Black Bezel, Silicone Strap Details: automatic caliber 4R36 with manual winding capacity 23 jewels day and date stop second hand uni-directional rotating bezel 41 hour power reserve (approximate) stainless steel case Sapphire crystal with magnifier black dial silicone strap with pin buckle water resistant to twenty bar case diameter: 45mm case height: 13.4mm lug width: 20mm