An authentic new Omega Speedmaster Professional Moonwatch featuring the Master Chronometer designation. Equipped with an automatic chronometer chronograph movement (Calibre 3861). Case is made of stainless steel measuring 42mm in diameter and has a thickness of 13.58mm, solid case back, round shape; bezel is fixed. Secured by deployment buckle with push-button clasp. Strap supplied is black nylon material. Black dial includes silver tone hands and hour/minute index markers against the outer minute track, plus three sub-dials displaying chronograph functions (60 seconds, 30 minutes, 12 hours). Crystal is Hesalite type. Water resistant to 50 meters / 165 feet.