ZENITH Solidifies its Worldwide reputation as the foremost manufacturer of precision chronometers and instruments throughout lots of domains. Ming did not just slap the movement in a situation and simply call it per day. The movements have been overhauled, up to date, and refinished by La Joux Perret in La-Chaux-de-Fonds. https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/