Seiko model SRP215K  - Calibre: 4R36 Seiko 5 Sport Automatic + Hand-Winding Newest movement - Authentic Brand New Seiko 5 Men’s Automatic Sports Diver Watch, 100 Meters WR, Screw See-Through Case back 24-Jewels Movement, Watch comes with Instruction Manual - Box - Questions Please email - Inventory  C 15 -P 10-2012-1