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: Titanium with White PVD Coating, Tonneau Caseback: Sapphire, Screw-in, Transparent Bezel: Titanium with White PVD Coating, White Dial: Transparent, analog Functions: Hours, Minute, Second Strap: Rubber with Leather insert, White Clasp: Tang, Titanium with White PVD Coating Crystal: Sapphire Crown: Screw-down Movement: automatic Water Resistance: 3 atm/30 meters/100 feet Power Reserve: 7 Days Case measurements: 45 mm in diameter x 14 mm thick Strap measurements: 27 mm wide x 8 in long Country of Origin: Switzerland Model: 45S6SQTWHTCOLBU All 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. .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 ush into position to set time, date, and other functions. To close the crown, press it against the case and turn clockwise.