Omega Speedmaster, the soul of Omega. Manual 3861 transparent case back version, the latest fourth generation Speedmaster watch for moon landing. Model .30.42.01.002 is a classic chronograph.The watch features a diameter of 42mm and a thickness of 13.6mm, with a durable stainless steel strap and linkage, scratch resistant sapphire crystal, and a flat printed Omega logo. The dial design features a classic and serious black and white color combination.The TACHYMETRE scale uses a linear scale with a recessed dial, symmetrical chronograph sub dials, and slender stick hands. The chronograph second hand slightly exceeds the dial markings to ensure clear visibility from all angles. The three sub dials are positioned at 9 o clock, 3 o clock, and 6 o clock, respectively, displaying the running seconds, 30 minute timer, and 12 hour timer.The strap features a five link design, which appears finer, rounder, and slimmer compared to the previous three link strap. The clasp has also been redesigned from a round shape to a flat one, featuring six grooves.The watch s design is minimalist and practical, making it an exceptional chronograph.