OMEGA 9904

The Omega caliber 9904 is an automatic chronograph watch movement with a moonphase complication. It is also the first Speedmaster movement to be certified as a Master Chronometer. The self-winding movement includes a column wheel mechanism and Co-Axial escapement for greater long-term performance. Resistant to magnetic fields reaching 15,000 gauss, it features a silicon balance-spring and rhodium-plated finish with Geneva waves in arabesque.