For Timepiece aficionados and connoisseurs, a COSC-validated timepiece isn’t only a product of tech but a proof to lasting excellence and accuracy. It represents a timepiece that: Gives superb dependability and precision. Lange & Söhne. I’ll describe why: the German model stepped onto the chronograph phase with their Substantially-praised Datograph https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/