Authentic Longines men's chronograph watch from the Master Collection, model L2.919.4.51.7 featuring an automatic movement and a 64-hour power reserve. The stainless steel case measures 42mm in diameter with a round shape and fixed bezel, paired with a black leather alligator strap equipped with deployment clasp and push button fold-over mechanism. The design includes scratch-resistant sapphire crystal, moon phase sub-dial display, silver hands, Roman numeral hour markers, minute track along the outer rim on a black dial, date function at 6 o'clock, water resistance up to 30 meters (100 feet), and comes with a 2-year WatchMaxx warranty.