Authentic Tudor Black Bay 31. Brushed and polished steel case with champagne light tone dial, silver tone hands, dot/index hour markers, minute markers on outer rim, brushed and polished stainless steel bracelet band equipped with folding clasp. Powered by Tudor Calibre MT5201 COSC automatic movement featuring a 50-hour power reserve. Includes screw down crown, scratch resistant sapphire crystal. Round case shape measuring 31mm in diameter. Water resistant to 100 meters (approximately 330 feet). Comes with a 5-year WatchMaxx warranty.