Omega caliber 9301
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if you make a purchase.
Special version of the column wheel, co-axial caliber 9300 for use in gold watches.
Self-winding chronograph with Si14 Silicium balance spring, co-axial escapement, two barrels, column wheel and vertical clutch.
Since 2015 certain watches containing this movement may carry the 'Master Chronometer' certification, indicating they have gone through the METAS testing cycle