Stuhrling Original Men's 'Tourbillon' Mechanical Hand Wind Stainless Steel and Black Shark Skin Dress Watch (Model: 407A.333X31). 44mm 23K gold-plated stainless steel round case on a black sharkskin strap. Black skeleton dial with tourbillon, open heart at 6 o'clock and luminous hands. Mechanical-hand-wind Movement. Case Diameter: 44mm. Water Resistant To 165 Feet.