Omega Speedmaster series, "Omega Soul" manual 3861 back-through model, the latest moon landing fourth-generation Speedmaster watch. 30.42.50.01.002 is a classic chronograph with a diameter of 42m/13.6m and a stainless steel watch. Belt and bracelet, wear-resistant blue light glass, flat printed Omega logo. The dial design is classic and serious in black and white. The TACHYMETRE tachymeter ring uses a linear scale, a sunken dial, a symmetrical chronograph digital dial and a small baton pointer. The chronograph second hand Slightly beyond the dial scale to ensure clear indication from all angles. The three-eye timing ring is located at 9 o'clock, 3 o'clock and 6 o'clock, which are used to display the daily running time second hand, 30-minute timing and 12-hour timing respectively. The strap uses five The bead strap design is thinner, rounder and thinner than the previous three-section plate strap with decorative patterns. The buckle has also been changed from a round to a flat design with six grooves. The watch has a simple design and practical functions. Very excellent chronograph multifunctional mechanical watch,