Authentic Omega men's watch model number 434.13.40.20.03.001 (also known as 43413402003001). Features an automatic movement powered by the Calibre 8800 with a 55-hour power reserve, round stainless steel case measuring 41mm in diameter and 9.9mm thick, blue dial accented by scratch-resistant sapphire crystal and Roman numeral/index hour markers along with minute markers around the outer rim, equipped with date functionality, includes a leather strap (likely alligator skin) and tang clasp fastening mechanism, has a transparent case back allowing visibility of the movement.