Produced by TT factory (three codes in one) belt 1500 steel belt 1550 Longines Pioneer launches a flyback chronograph watch! 1 Diameter 42 mm, bidirectional rotating ceramic light ring, super luminous ring, Arabic numerals luminous through black holes, synchronized with the official website. 2 The dial is black and blue, with the chronograph dial at 3 o'clock and the chronograph dial at 9 o'clock. Small seconds dial, the central large second is the chronograph large seconds hand. The "FIyback" flyback function is marked at 6 o'clock on the dial, which is a very convenient chronograph. 3 The sapphire crystal mirror is slightly arched, with anti-glare coating on both the inner and outer surfaces, and the two-way rotation is precise and smooth. The watch is equipped with a screw-in crown that is easy to grasp and adjust, and the sealed case back is made of 6 diamonds. Fixed with screws, it has excellent waterproof performance. 4. Stainless steel bracelet, with different versions of calfskin strap and NATO blue fabric strap, original folding clasp, suitable for different styles of wearing needs. 5. With original authentic L791.4 Self-winding movement, capable of providing up to 68 hours of power reserve.,,longines,cowhide