ZENITH Solidifies its Worldwide popularity since the top manufacturer of precision chronometers and instruments throughout many domains. ZENITH launches the 135-Observatoire constrained version, creating the acclaimed 135 calibre, serial winner on the international Chronometry competitions, commercially available for the pretty initial time in its Observatory variant ! All eleven units https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/