The Seiko Prospex SPB381J1 is a remarkable timepiece with a 42 mm stainless steel case featuring a super hard coating. The black sunburst dial is enhanced with LumiBrite on the hands and indexes, ensuring visibility in low-light conditions. It is protected by a crystal with an anti-reflective coating on the inner surface. The watch is powered by an automatic movement with manual winding capacity, boasting a 6R54 caliber and an impressive power reserve of approximately 72 hours. The stainless steel bracelet includes a three-fold clasp with a secure lock. Additional specifications include a screw case back, screw-down crown, and a unidirectional rotating bezel. Water-resistant up to 200 meters (660 feet), this diver's watch is backed by a 3-year international warranty.