Omega speedmaster moon watch co axial chronograph self winding chronograph movement with column wheel mechanism and co axial escapement for greater precision stability and durability of the movement silicon balance spring on free sprung balance 2 barrels mounted in series automatic winding in both directions to reduce winding time rhodium plated finish with exclusive geneva waves in arabesquepower reserve 60 hoursmovement caliber omega 9300 self winding chronograph movement with column