SEIKO SRPD51

 Caliber 4R36 Automatic Movement: Automatic with manual winding, \~41 hr power reserve, 24 jewels, stop-second & day/date
 Stainless-Steel Case: 42.5 mm × 13.4 mm (46 mm lug-to-lug), 22 mm lug width, weight 170 g
 Hardlex Crystal & LumiBrite: Durable glass; luminous hands & indices
 Unidirectional Rotating Bezel & Screw-Down Case Back: Dive-ready timing and exhibition window
 10 bar Water Resistance & 4 800 A/m Magnetic Resistance
 Secure Three-Fold Clasp: Push-button release with safety lock