Seiko Auto 100m - SRPB33J1 Movement: 4R36 - Automatic 24 jewels Made in Japan 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 Case reference: 4R36-06B0 Case diameter: 43.8mm Case thickness: 13.2mm Bracelet reference: W22-M0KW-BI-613 64-21051017769-TW