OMEGA Seamaster Planet Ocean 600M co-axial master chronometer chronograph 45.5mm.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,66 hours power reserve.Steel casing and bracelet,grey ceramised titanium dial and orange ceramic bezel, and sapphre crystal and water resistant to 600 metres.