"An Insightful guideline over the heritage of British watchmaking. Horology lovers of all degrees are guaranteed to find value here." The third massive stage happened in the early 1900’s. The shape of your timekeeping equipment altered in favor from the wristwatch. The first chronometer wristwatch motion arrived in about 1910, https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/