Belt model. The Longines Pioneer has launched a flyback chronograph wristwatch. 1. With a diameter of 42mm, the bezel is bi-directionally rotating with a glossy finish, featuring super strong luminous Arabic numerals that shine through small black apertures, synchronized with the official website. 2. The dial comes in black and blue; the 3 o'clock position features the chronograph sub-dial, while the 9 o'clock position displays the small seconds. The central large seconds hand is for the chronograph, and the 6 o'clock position on the dial indicates the Flyback function, making it a very convenient timing chronograph. 3. The sapphire crystal is slightly domed and treated with anti-reflective coating on both sides, ensuring precise and smooth bi-directional rotation. The watch is equipped with a screw-in crown that is easy to grip and adjust, while the sealed case back is secured by six screws, providing excellent water resistance up to 100 meters. 4. The stainless steel bracelet is paired with a calf leather strap and a NATO blue fabric strap, offering different versions with an original folding clasp to meet various style preferences. 5. It is powered by the original L791.4 automatic winding movement, capable of providing up to 68 hours of power reserve.