For Timepiece aficionados and connoisseurs, a COSC-validated timepiece isn’t just a merchandise of tech but a evidence to lasting excellence and accuracy. It signifies a timepiece that: Supplies superb dependability and precision. There you've got it, five brands that have played a big role in the development of the chronograph. https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/