The key to a watch’s accuracy is the escapement. This is the device that transfers energy to the timekeeping piece, keeping the oscillation going at a steady pace. For hundreds of years the gold standard of escapement was the Swiss lever escapement, which pushes the balance wheel back and forth, causing the gear train to advance and the hands to move. This escapement works well, but it causes a lot of friction, requiring regular lubrication to keep the watch working well. But in 1999 Omega changed 250 years of timepiece design by introducing the Co-Axial escapement. It uses lateral impulses instead of sliding movements to generate energy, resulting in reduced friction, greater mechanical efficiency, and superior shock resistance. Because of this, Co-Axial watches last longer and need less servicing. Find your perfect Omega Co-Axial watch within the vast inventory listed on eBay.