"An Instructive information on the heritage of British watchmaking. Horology supporters of all degrees are positive to locate value here." The 3rd massive phase transpired within the early 1900’s. The shape in the timekeeping equipment transformed in favor from the wristwatch. The initial chronometer wristwatch motion arrived in about 1910, https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/