The Longines Spirit Flyback L3.821.1.53.2 is a 42 mm titanium watch featuring an anthracite dial with applied Arabic numerals. It is powered by the automatic L791.4 movement, offering a 68-hour power reserve and a flyback chronograph function. The watch includes a bi-directional rotating bezel with a black ceramic insert, a screw-in crown, and is water-resistant up to 100 meters. It comes with a black nylon strap and a titanium pin buckle. Reference number: L3.821.1.53.2.