Seiko Prospex Diver's 200m - SRPB51J1 Movement: 4R35 - Automatic 23 jewels Case and bracelet - stainless steel. Crystal: Hardlex Power reserve: 41 hours 21,600 vibrations per hour Screw case back Screw-down crown Three fold clasp with secure lock, push button release with extender Case diameter: 43.8mm Case thickness: 13.2mm Bracelet reference: W22-M0FP-ZC 64-21059017769-TW