When it comes to Swiss watches , the first thing we think of when we think of it is that travel time is accurate and of good quality, as if it is their natural property. Why so? The centuries-old watchmaking culture, traditions and craftsmanship are, of course, the foundation. In addition, to keep the gold content of this international flagship, the Swiss have not bothered to make any markings or certifications that they are trying to differentiate themselves from watch products in other regions One of the measures, by leaving a variety of "imprints" on the watches , leaves them with precise and reliable "imprints" in the minds of consumers. (Source: Time to spread) Our most familiar COSC and Geneva Seal are the most representative quality certification systems in the Swiss watch industry. As the industry develops, these two big brother families can not fully cover the needs of the industry. Therefore, other Some certification systems have also been produced. We will be divided into four for everyone to introduce one of the most representative quality certification and the new certification faction. Background and certification body Swiss official observatory certification, Contrôle Officiel Suisse des Chronomètres, referred to as COSC, was founded in 1973 by the five watchmaking states namely, Bern, Geneva, Neuchâtel , Solothurn and Vaud together with the Swiss watch industry The non-profit organization co-founded by the Confederation established three independent laboratories from the late 20th century onwards to test the manufacturer's motivation. Its regulatory agency coordinates the operation of three laboratories, conducts measurement and test results management and is responsible for the maintenance of equipment, establishes testing programs, develops equipment and measurement tools for the assessment laboratories for different types of certifications submitted for certification, markets them externally Communicate and protect certified precision timepieces in the broadest sense. Certification object Mechanical and quartz watch movement. Emphasize two points: a) The subject of certification is the movement; b) Yes, the quartz movement can also be COSC certified. The COSC certified movement can be called "Chronometer" Certification standards The mechanical center of the COSC certification test is based on the international standard ISO 3159 "precision balance with balance spring system." According to the standard, certified samples should be tested in 5 positions and 3 temperatures for 16 consecutive days. According to the test data, 7 indicators including average daily difference are calculated. Only when they meet the established standard, can the samples be certified. Our well-known -4 ~ + 6 seconds / day, in fact, is only one of seven indicators of the average daily difference. Related watch brands COSC certified customers mainly include Rolex , Omega , Tissot , Mido (Mido), Breitling (Breitling), Panerai and Chopard and others. 2013 COSC-certified mechanical movements of nearly 1.73 million, Rolex contributed nearly 820,000, is visible COSC absolutely large customers, Swatch's Omega nearly 480,000, Tissot and Mido each of nearly 80,000. Breitling claims 100% COSC certification across the board, more than 160,000 mechanical plus quartz. question At present, the main challenge faced by COSC and criticism is that the object of certification is only the movement. We all know that the travel time performance of the movement can not be equated with the accuracy of the schedule. After the movement is completed, the inventories of the assembly and the assembly process The same impact on the timetable can not be ignored. Poly fashion watch mall Recommended reading: Quartz watch is good or mechanical watch good ladies watch brand list the world's top ten watch brand watch list