Omega Speedmaster, first watch sent to space with a blue dial and leather strap. Brushed and polished stainless steel case. Fixed aluminum bezel featuring tachymeter scale. Blue grey dial with luminous silver tone hands and stick hour markers including minute and sub-dial markers around the outer rim and three sub-dials displaying seconds, 30 minutes, and 12 hours. Swiss manual winding movement powered by Omega Calibre 3861 engine offering a 50-hour power reserve (power reserve function). Chronograph functions with separate second, minute, hour sub-dials for time measurement up to 50 minutes in each category. Includes speed functionality. Push-pull crown activation system. Scratch resistant sapphire crystal lens ensuring clear visibility and durability. Round case shape measuring 39.70mm in diameter and 13.40mm in thickness with solid case back construction. Rated at 50 meters (approximately 165 feet) water resistance for general aquatic use. Comes equipped with a 5-year WatchMaxx warranty providing comprehensive coverage. Also known as model number: 31032405006001.