Taking the hugely successful Navy Seal Colormark 3050 Series, and making it even more rugged, Luminox released the 3150 series, with a matte 44mm black ion plated stainless steel case and bracelet replacing the carbon reinforced polycarbonate case. This gave the watch a more dressy feel when needed, and even more rugged and unbeatable.The Colormark standard features of Swiss Quartz, date, and unbeatable legibility remain unchanged, thanks to the LLT Luminox Light Technology gas tubes fitted to the bezel, markers and hands.