The Longines Spirit Flyback L3.821.4.53.9 is a 42mm stainless steel watch featuring a black sunburst dial with luminous bronze-tone hands and Arabic numeral hour markers. It is powered by the Longines Caliber L791 automatic movement, offering a 68-hour power reserve and flyback chronograph functionality. The watch includes a bi-directional rotating bezel with a ceramic insert, a scratch-resistant sapphire crystal with anti-reflective coating, and a transparent case back. It is water-resistant up to 100 meters and comes with a beige synthetic fabric strap. Reference number: L3.821.4.53.9.