Longines Black Dial Fixed Stainless Steel Band Watch # L2.718.4.50.7 (Men Watch). Band Color : Black. Dial Color : Black. Display Type : Analog. Item Shape : Round Shape. Band Material : Alligator leather. Case Size Diameter : 42 millimetres. Case Material : Stainless Steel. Bezel Material : Fixed Stainless Steel. Crystal : Synthetic sapphire. Water Resistant Depth : 30 meters. Movement Type : Automatic. Model Number:L2.718.4.50.7 L2.718.4.50. L2.718.4.50 L2.718.4.5.