Seiko Prospex SPB187J1 1968 Mechanical Divers Contemporary Design 24 Seiko Prospex Marinemaster Automatic With Manual Winding 42.6mm MARINEMASTER Seiko Launch Prospex 60th Anniversary Marinemaster 600m Saturation. Experience precision and durability with the Seiko Prospex Marinemaster Automatic. Designed for scuba diving enthusiasts, this watch features a striking blue dial paired with a robust silver steel strap, ensuring both style and resilience underwater. Its automatic movement guarantees reliable timekeeping without the need for batteries, making it an essential companion for your marine adventures. The SPB187J1 combines professional functionality with classic design, perfect for men who demand performance and elegance in every dive. 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 Japans first divers watch in 1965, Seikos innovative technology has changed global standards. We are constantly striving to bring ever greater reliability and safety to both professional and recreational divers. Seiko prospex automatic men's watch SPB187J1. Stainless steel (super hard coating) case with a stainless steel bracelet, blue dial. Automatic movement with manual winding. Sapphire crystal, anti reflective coating on inner surface. Lumibrite on hands, indexes and bezel. Three fold clasp with secure lock , push button release with extender. Water resistance upto 200m 660ft diver's. Case thickness 12. 5 mm, case diameter 42 mm, case length 48. 8 mm. Bracelet length 200 mm. Screw case back. Screw down crown. Unidirectional rotating bezel. Other Features: 24 jewels, date display, stop second hand function. Seiko Prospex Marinemaster Series Automatic with Manual Winding #SPB187J1 Blue Dial Analog Display 200m Water Resistance Caliber 6R35 24 Jewels Sapphire Crystal Stainless Steel Case (Super Hard Coating) Anti Reflective Coating on Inner Surface Date Indicator Lumibrite on Hands, Indexes and Bezel Stop Second Hand Function Screw Case Back Screw Down Crown Three Fold Clasp with Secure Lock Unidirectional Rotating Bezel Accuracy: +25 to 15 Seconds Per Day Duration: Approx. 70 Hours Case Size Diameter: 42mm Case Size Thickness: 12. 5mm Case Size Length: 48. 8mm Weight: 186g Brand, Seller, or Collection Name Seiko Model number SPB187J1 Part Number SPB187J1 Item Shape Round Dial window material type Sapphire Crystal Display Type Analog Clasp Push Button Foldover Clasp With Safety Case material Stainless Steel Case diameter 42 millimeters Case Thickness 12. 5 millimeters Band Material Stainless Steel Band size Mens Standard Band width 20 millimeters Band Color Silver Dial color Blue Bezel material Stainless Steel Bezel function Unidirectional Calendar Date Special features Bezel Markings Movement Japanese Automatic Water resistant depth 200 Meters