For Timepiece aficionados and connoisseurs, a COSC-validated timepiece isn’t just a item of tech but a proof to lasting excellence and precision. It signifies a timepiece that: Gives superb dependability and precision. Together with his smaller team, Ellis searched domestically for manufacturers who could make the elements to his measurements. https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/