If you have the experience of buying a rolex replica, then the term of the COSC Observatory will not be unfamiliar, the vocabulary will appear repeatedly in the salesman's mouth, and many people until the end of the purchase list may not really understand the COSC Observatory in the end what is the meaning, Or what it is in the end. The editor of the watch home to a comprehensive introduction to the COSC Observatory certification, take a look at the COSC Observatory watch in the end what is it. COSC Observatory COSC is an abbreviation for Controle Officiel Suisse des Chronometres (Swiss official observatory testing agency). Refers to the movement of the watch sent to the Swiss Observatory for precision testing, who can pass the precision test of the movement can be marked on the dial watch with the words of the Observatory - Chronometer. "Chronometer" in the English dictionary is generally interpreted as "precision timer", from the etymology it comes from the Greek Chronos and Metron combination, the original intention of measuring the meaning of time. Swiss official observatory testing agency is an independent official body, referred to as COSC. Was founded in 1973 by five Swiss watchmakers (Berne, Geneva, Newcastle, Solothurn and Vaud) and the Swiss Watch Industry Federation, which has now become a nonprofit legal organization. Cosc test - 16 days of testing cycle, seven tests One detection period is 16 days. All tested watches are assigned a universal dial to test, and the movement will be engraved with a unique identification code, COSC will be strictly in accordance with its designated standards to perform. This universal dial includes a reference point system that allows the image to be absolutely centered and the movement of the movement below the camera allows the measurement to be affected by the movement of the movement. Each watch is with the brand all the technical indicators came to the COSC (for example, the movement of the main plywood with the test). Each watch is affixed with a bar code, so you can track the whole. The first program is in the COSC computer system for watch recognition, and then in the tray to identify the packaging and then automatically refining, rest 24 hours after the first off the test. In the next 15 days, including Saturday and Sunday, a series of repeated tests will be conducted. In the first stage, the time at which the watch is displayed is replica watches recorded on a receiver controlled by an atomic clock, respectively. The time of these records will determine the persistence of the movement in the experiment. Each of the tests will be in three different periods (6 o'clock, 3 o'clock, 9 o'clock vertical position, dial side and side of the movement side of the horizontal position) and 23 ° C, 8 ° C and 38 ° C three different Temperature. COSC offers seven different tests, as long as there is no one through the minimum standards, it means that the movement did not pass the test. The seven tests are briefly described below: 1. Average day difference: Through the fifteen days of testing, the average daily difference in the movement must be in the range of -4 seconds to +6 seconds, and the average daily difference of COSC is observed by subtracting the movement time observed 24 hours before the day The movement indicates the time to get. 2. Average daily variation: The COSC measures five travel delays, two horizontal and three vertical directions per day. After fifteen days of testing, a total of 50 bits of data are obtained, and the average average difference in the daily variation must be less than 2 seconds. 3. Maximum day variance: The maximum difference between the five measuring positions is not more than five seconds per day. 4. Horizontal and vertical position of swiss replica watchesthe difference: The average position difference of the horizontal position measured at the fourteenth and fifteenth days is subtracted from the vertical position average difference measured by the first and second days and must be in the range of -6 seconds to +8 seconds. 5. Maximum day deviation: The difference between the maximum daily difference and the average daily difference must be less than 10 seconds per day. 6. Variation caused by temperature difference: The movement were placed at 8 degrees Celsius and 38 degrees Celsius in the environment measured daily difference, the high temperature environment difference between the sunny day of the low temperature environment, and then divided by 30 can be caused by the temperature difference caused by the difference, its size Must be less than 0.6 seconds / day. 7. Recovery difference: The average daily difference measured on the last day minus the average difference between the first two days is the difference in recovery, and the size must be controlled within 5 seconds. Observatory watch Observatory certificate According to the COSC's own definition, "the Observatory is a high-precision watch that has been tested by the official body (COSC) at different locations and temperatures for several days to display the second hand and contains the movement. Only the accuracy of ISO 3159 is set The standard of the movement can be issued by the official Observatory watch certificate. COSC and brand The brand will watch to the COSC for testing, once through those harsh conditions of the test watch, can get the disk logo and an Observatory certification. The certificate will not only contain all the test data to prove that the watch also has a different number of the Observatory, most of the watch factory Observatory certificate will remain in the original, consumers see the watch factory-made Observatory watch card. Once, Omega has the largest number of Observatory watchs, currently with Rolex has the largest number of Observatory watchs. Basically Rolex, Omega, Breitling, Delta, Tissot, Panerai, Chopin these seven brands support more than 90% of the annual COSC certified total. The entire certification process, the brand will be invested, which will cause the cost increase, so we see in the market after the Observatory certification of the watch is usually less than the Hong Kong Observatory certification. In general, the price will be floated by detecting the movement and the same movement that did not pass. But not all brands are obsessed with the COSC certification, some top brands, such as Patek Philippe, Vacheron Constantin, love they will not look on the certification above, they will follow the more stringent testing standards. Summary: Through the above content we can see COSC is a certification body, similar to what we often hear ISO. Those who meet the COSC test standard movement, can get a certificate of astronomical watch. So, the Observatory watch is through the COSC certified watch. COSC certified watch is not a sub-seconds is not bad, COSC error standard is -4 / +6. There are a lot of Swiss watch brands will be its movement to the COSC certification, to get a certificate. COSC agencies have also responded to this, they do not want this certification simply become a brand marketing content. But for now, COSC Observatory certification is too much publicity. However, it is certain that the COSC certified Observatory watch is able to ensure a certain degree of accuracy, which is the most primitive of the original function of the guarantee. Between the current watch a wide variety of publicity, the COSC certification is one of the most real one. In the end, or to remind the purchase of the watch, COSC certification is only a reference, do not let it become the final weapon you buy the watch. Now the ETA movement as long as a simple grinding, through the COSC certification is not difficult, and did not pass the COSC certified watch does not mean he is not good. COSC certification is generally only for mechanical watches, because the quartz watch for this certification is meaningless, their travel time accuracy will be higher than the COSC certification standards (quartz watch COSC certification for -0.07 / +0.07). So, do not be obsessed with the sounds of the COSC Observatory, and the Observatory here is not relevant to the observatory you are familiar with