OMEGA Speedmaster Chronoscope Co-axial Master Chronometer Chronograph 329.92.43.51.10.001Manual winding chronograph with column wheel and CoAxial 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 counter, 12 hour and 60 minute counter. Rhodium plated finish with Geneva waves in arabesque. MOVEMENT Calibre: OMEGA 9908 Power reserve: 60 hours