To comply with the new e-Privacy directive, we must question for your personal consent to set the cookies. Learn more If your Omega has the words 'Grasp Chronometer' to the dial—as is found within the Seamaster Diver 300M—you could be assured that its timekeeping is par excellence Harrison’s initial attempt, https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/