ZENITH Solidifies its international status because the major manufacturer of precision chronometers and devices across quite a few domains. The 3rd huge move transpired while in the early 1900’s. The form of the timekeeping apparatus adjusted in favor in the wristwatch. The 1st chronometer wristwatch motion arrived in about 1910, https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/