Gent's 18K White Gold 38mm Chronoswiss "Régulateur à Tourbillon " Mechanical Item #: CT37943 Brand: Chronoswiss Model: Régulateur à Tourbillon Reference No: CH 3121 W Gender: Gent’s Movement: Handmade Swiss Mechanical(Manual-winding) Movement Visible Through Sapphire Exhibition Caseback. Case Measurements: Case Diameter: 38mm Case Thickness: 10.5mm Water Resistance: 30m / 100ft Power Reserve: 42hr Dial: Full Skeleton Markers: Black Roman & Arabic Numerals Bracelet / Strap: Chronoswiss Black Alligator Strap with 18K White Gold Chronoswiss Tang Buckle. Features: Blued-steel "Poire Stuart" Hands, Black Roman & Arabic Numerals, Off-center Hour Subdial. 18K White Gold Bezel with Full Thread and Side Knurling, Tourbillon, Onion-style Crown, Sapphire Crystal.