Movement: Omega manual winding calibre 9906, beats at 28,800 vph (4Hz), contains 45 jewels * has a power reserve of 60 hours. METAS Certified Master-Chronometer: The assembled watch, with its COSC certified Chronometer movement, passes rigorous tests that replicate real-life conditions. The METAS certification tests water resistance, precision and magnetic resistance. Anti-magnetic: resistant to magnetic fields greater than 15,000 gauss. Features Omegas Si14 silicon balance spring & Co-Axial Escapement. The back-plate is rhodium plated & decorated with Geneva waves in arabesque design.