Motion: There are 3 differing kinds to look at. A quartz motion is known for its accuracy and lower servicing. It's driven by a battery and is generally additional economical. So If the Omega has the phrases ‘Grasp Chronometer’ about the dial—as is viewed On this signature Omega Seamaster Diver https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/