Chase-Durer Men&#39;s 117.9WA6 Pilot Commander USAF Thunderbirds Stainless Steel Watch Quality Japanese-quartz movement Scratch-resistant sapphire crystal Solid 316L brushed stainless steel case and three-link stainless steel bracelet; screw-down crown and engraved, screw-down case back; unidirectional bezel with 36B navigational slide rule markers Super-Luminova advanced illumination system; chronograph functions with 12-hour, 60-minute, and 1/20th second sub dials; date function at 4 o'clock Water resistant to 330 feet (100 M): suitable for snorkeling, as well as swimming, but not diving