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• 316L Surgical-Quality Stainless Steel Case • 22 Jeweled Automatic Movement • 36-Hour Power Reserve • Beats per Hour (BPH): 21600/Hour • Average gain/loss Rate: +/- 45 Seconds per Day • Sapphire-Coated Mineral Crystal • Observation Case back to view Movement • 316L Surgical-Quality Stainless Steel bracelet • Logo-Engraved Stainless Steel Clasp • Luminous Hands and hour markers • Open front dial to view movement • 42mm Diameter • Pro Diver 20atm 200 meter water resistance. Qualifies for professional marine activity; serious surface water sports and skin diving. Water Resistance: 0 atm;