Motion: There are a few differing kinds to contemplate. A quartz motion is noted for its accuracy and low upkeep. It is driven by a battery and is mostly more cost-effective. Should your Omega has the terms 'Grasp Chronometer' to the dial—as is found during the Seamaster Diver 300M—you can https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/