If you are looking for a diver's watch with high quality and reliability, this watch is undoubtedly a model to consider. SEIKO PROSPEX DIVERS SLA039J1 is one of Seiko most respected professional diver's watches to date, and one that any diver would no doubt use as a mechanical backup device for the best digital gear available. No other professional diver's watch can match SEIKO PROSPEX SLA039J1's unbeatable combination of price, performance, build quality and signature style. It has a 44.8mm steel case with an anti-reflective sapphire crystal that allows you to see the LumiBrite hands and indexes, all secured under a screw-down crown that provides a water resistance of up to 300m. A series that mounts a caliber 8L55 ( Seiko high-end caliber, handmade) and has a power reserve of 55 hours. This movement has already been used in other diver's watches.