Case Thickness: 5 mm; Case Diameter: 38 mm; Band Width: 18 mm; Band Circumference: 200+/- 5 mm Strap Material: Leather; Movement: Two Hand-Quartz; Water Resistant: 3 ATM Japanese-quartz Movement Case Diameter: 38mm Water resistant to 30m (100ft): in general, withstands splashes or brief immersion in water, but not suitable for swimming or bathing