What is a watch Chronometer?
– A Chronometer is any watch that has undergone 15 days and 14 nights of testing from the COSC for accuracy. To gain this accreditation, watches must not exceed a daily variance of -6/+4 seconds in three different positions and under a variety of conditions. The COSC does not test for water resistance. Currently, there are only 5% of Swiss watches that are chronometer certified per annum. COSC certification is strictly reserved for mechanical watches only, with one major exception – Breitling Superquartz, touted as the world’s most accurate quartz mechanism.