OMEGA Speedmaster Racing Co-Axial Master Chronometer Chronograph 44.25mm 329.32.44.51.01.001MOVEMENT Calibre: Omega 9900 Self winding chronograph with column wheel and Co Axial escapement Certified Master Chronometer, approved by METAS, resistant to magnetic fields reaching 15,000 gauss. Silicon balance spring, 2 barrels mounted in series, time zone function. Central hour, minute and chronograph seconds hands, small seconds hand, 12 hour and 60 minute recorders. Rhodium plated finish with Geneva waves in arabesque Power reserve: 60 hours