Franck Muller graduated from the renowned watchmaker's school in Geneva, his hometown. Although he began producing watches a decade earlier, it was only in 1991 that he established the company that bears his name. Franck Muller is an accomplished and highly-skilled watchmaker that produces some exceptional timepieces, most of which are of limited edition. Case: 18K Rose Gold, TonneauCaseback: 18K Rose Gold, Screw-in, Brushed, Engraved with Franck Muller hallmarkingBezel: 18K Rose Gold, Rose GoldDial: White, analogMarkers: Arabic numerals, White with a gold outlineCalendar: Date display window at the 6 o'clock positionFunctions: Hours, Minute, Second, DateStrap: Rubber with Leather insert, WhiteClasp: Tang, 18K Rose GoldCrystal: SapphireCrown: Screw-downMovement: automaticWater Resistance: 3 atm/30 meters/100 feetPower Reserve: 42 HoursCase measurements: 45 mm in diameter x 13 mm thickStrap measurements: 27 mm wide x 8 in longCountry of Origin: SwitzerlandModel: 45SCWHTWHTGLDSNAll measurements are approximate and may vary slightly from the listed dimensions.Men's watch bands can be sized to fit 7.5-inch to 8.5-inch wrists. Extra links are available through the manufacturer. (We do not provide this service).Automatic movement winds with the movement of your arm. It is recommended that you wind the watch every two weeks.A screw-down crown (knob) creates a water-resistant seal. To unscrew the crown, turn counter-clockwise and pull/push into position to set time, date, and other functions. To close the crown, press it against the case and turn clockwise.