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