Bertucci A-4T Nautical 13435 Blue ION Titanium High-Viz Yellow Mariner Blue Tridura Watch Rugged U.S. patented DX3 solid titanium case Swiss made all-metal jeweled quartz analog movt. Scratch-resistant hardened mineral glass crystal Durable titanium screw down crown (setting knob) is ergonomically offset at 4 oclock Integrated unbreakable titanium band retention lug bars