An authentic Longines men's watch, model number L3.821.1.53.2 (also known as L3821/1 532). Features a brushed titanium case and black synthetic strap equipped with a tang clasp. Powered by the automatic Caliber L791 movement certified Swiss Chronometer. Equipped with Flyback Chronograph function, central chronograph second hand, small seconds sub-dial, and a 68-hour power reserve indicator. The dial displays luminous yellow gold tone hands and Arabic numeral hour markers including minute markers around the outer rim plus two sub-dials. Additional functions include hours, minutes, seconds, and date display (date function is standard on automatic Longines chronographs unless otherwise specified). Features sapphire crystal for scratch resistance, screw-down crown, round case size 42mm with thickness 17mm, transparent case back, and offers water resistance up to 100 meters / 330 feet. Comes with a 5-year WatchMaxx warranty.