ZENITH Solidifies its Intercontinental status as being the primary manufacturer of precision chronometers and instruments across several domains. Ming did not just slap the motion within a case and connect with it per day. The actions had 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/