Omega Speedmaster Professional ref 3572.50.00 is a must-have for any well-rounded watch box. Features include a desirable steel-on-steel finish a black Tachymeter bezel calibrated to 500 units and a matching black dial topped with three chronograph sub-dials. The case measures 42mm in diameter and is flanked by chronograph pushers above and below the crown. It also features Omega’s signature twisted Lyre lugs water resistance up to 30 meters/100 feet and a Hesalite crystal. Lastly ref. 3572.50.00 is powered by the cal. 1863 hand-wound movement complete with a rhodium-plated finish and a 48-hour power reserve.