"An Enlightening guideline on the heritage of British watchmaking. Horology fans of all stages are sure to uncover worth here." The third big move happened inside the early 1900’s. The form of the timekeeping apparatus modified in favor in the wristwatch. The first chronometer wristwatch movement came in about 1910, https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/