Fortis Black Automatic Watch # 638.18.31-MPVD (Men Watch). Band Color : Black. Dial Color : Black. Display Type : Analog. Item Shape : Round Shape. Band Material : Stainless Steel. Case Size Diameter : 42 millimetres. Case Material : Black PVD Stainless Steel. Crystal : Scratch Resistant Sapphire. Water Resistant Depth : 200 meters / 660 feet meters. Movement Type : Automatic. Calendar Type : Day of the Week and Date. Model Number:638.18.31-MPVD 638.18.31-MPV 638.18.31-MP 638.18.31-M.