Montblanc Men's 'Timewalker' Automatic Stainless Steel and Leather Dress Watch, Color:Black (Model: 36065) Automatic self winding movement Case diameter: 42 mm Stainless steel watch Scratch resistant sapphire crystal protects watch from scratches, Water resistant to 99 feet (30 M): withstands rain and splashes of water, but not showering or submersion