“Chronometer”, this is a vocabulary you will encounter when you come into contact with a high-end watch. Many people feel watch in this title, and even directly understand it literally: those watches called “Astronomical Observatory” should be the most accurate professional watches worn by researchers from major observatories around the world, and even have some A function that is not accessible to ordinary people. In fact, in the field of watches, diving watches, aviation watches, racing watches, etc. are indeed developed for divers, aircraft pilots, racing drivers to meet their special needs, these watches are waterproof, anti-magnetic, robust and timing function The aspect has a unique design, and the “Astronomical Observatory” has nothing to do with the units that have large telescopes.
The Observatory’s watch and the slightly professional vocabulary – “Astronomical Observatory” are one thing, related to an official Swiss agency that tests the precision of watches for major watch manufacturers, abbreviated as C.O.S.C.
In order to obtain the Observatory certification, each movement must be tested in three temperature and five positions 24 hours a day, 24 hours a day, continuously at C.O.S.C. The items evaluated by the test included: average daily speed, average speed change, maximum speed change, speed difference at different positions, maximum speed difference, temperature influence value, and sustained speed.
The watch movement, which is rigorously tested by this mechanism, is the “Astronomical Watch Movement” and can be honored with the words “Chronometer” on the dial. There is also a beautiful certificate in the watch case. At present, more is the form of sampling inspection, that is, each pass represents one batch of qualified; the historical inspection is strictly strict, and C.O.S.C. often holds the time precision competition. In the early years, Patek Philippe won many awards in this competition.
However, it should be known that the mechanical watch meets the standard error of +4~-6 seconds per day because its accuracy meets the 99.99% specification. Like the Rolex watch, the watch difference can usually be controlled within two seconds. It is one of the most accurate mechanical watches in the world, so the accuracy of the mechanical movement chronometer is relative. If the accuracy of the watch is accurate, quartz The watch or atomic clock is many times stronger than the mechanical watch, but it loses the great charm of the machine.