For Timepiece aficionados and connoisseurs, a COSC-validated timepiece isn’t merely a merchandise of tech but a proof to lasting excellence and precision. It signifies a timepiece that: Gives excellent dependability and precision. ZENITH launches the 135-Observatoire constrained edition, making the acclaimed 135 calibre, serial winner in the Global Chronometry competitions, https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/