IWC Black Automatic Watch # IW376421 (Men Watch). Band Color : Black. Dial Color : Black. Display Type : Analog. Item Shape : Tonneau Shape. Band Material : Alligator Leather. Case Size Thickness : 43 millimetres. Case Size Diameter : 51 millimetres. Case Material : Stainless Steel. Clasp Type : Deployment with Push Button. Bezel Material : Fixed. Bezel Function : Fixed. Crystal : Scratch Resistant Sapphire. Water Resistant Depth : 30 meters / 100 feet meters. Movement Type : Automatic. Calendar Type : Date. Model Number:IW376421 IW37642 IW3764 IW376.