However, in 2013 it was actually discovered that Louis Moinet developed the first chronograph, which he used with astronomical equipment.Ĭlick to read more about Louis Moinet on Originally it was thought that Nicolas Mathieu Rieussec developed the first chronograph in 1821 for King Louis XVIII. The earliest examples possessed a pen, hence the ‘writing’ part, which was attached to the index resulting in marks on the dial to indicating the elapsed time.
Various brands, including Rolex, certify each of their watches as a COSC-chronometer before they are ever sold.Ĭhronograph means “time writer” and hails from the Greek word for time, “chronos”, and the Greek word for writing, “graph”. They run tests on every single movement and certify them individually. The certification is completed by the Official Swiss Chronometer Testing Institute AKA the COSC. To be a certified chronometer, a watch must not lose more than 4 seconds or gain more than 6 seconds every day. You can imagine that over a couple of weeks, the discrepancy in time can grow exponentially.Ĭhronometers are watches that operate within strict requirements of time gained or lost.
For example, the average wristwatch may lose or gain 10 seconds a day. Note the “Superlative Chronometer Officially Certified” on Rolex dialsĮvery mechanical wristwatch is known to lose time every day.
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