Swiss made movement Ronda 712.3 lubricated with oil bath Hours, minutes, seconds, screw-down crown Stainless steel AISI 316L case with subsequent IPB treatment, completely filled with a special oil that emphasizes the dial,creating the illusion of the absence of glass, and an optical effect of a more intense black and higher legibility. Visible air bubble on the dial to compensate the temperature variations. Distinguishing crown on left side Case Diameter: 44 mm High quality curved sapphire crystal WATER RESISTANCE: 50 M, 5 ATM Ultra-resistant vulcanised rubber strap in black color Tongue buckle in steel with subsequent IPB treatment, Width: 22/20 mm