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Over 1.6 million watches are certified every single year, a figure that has grown substantially over the decades.

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There is currently no international standard for measurement of a watch with a quartz oscillator, so the one used by the COSC is based on the same ISO 3159 standard used in their measurement of mechanical wristwatches.Д¤.

The COSC doesnвЂ™t just measure mechanical wristwatches, they also measure pocket watches, fixed time devices such as onboard instruments and carriage clocks, and quartz timepieces. If the watch passes these guidelines, it is officially awarded the certification.ДЈ. At the end of that time period, the wristwatches are judged by seven different criteria: average daily rate, mean variation in rate, greatest variation in rate, the difference in rates in horizontal and vertical position, largest variation in rate, and variation in rate depending on temperature and rate resumption. Each day, the clocks and watches are measured and reassembled. Then, over the next 15 days, the parts of the wristwatch go through daily tests. The main reason for the exclusion of other countries is that since the COSC functions as a non-profit, this helps ensure both the prestige and caliber of both the certification and the Swiss watch industry as a whole.Дў To have a watch pass the certification, the movement must be sent to one of the COSC labs where it immediately goes through the following: tests the numbers engraved on the movement (in relation to the list supplied by the applicant), the movement is placed in a 5-slot clasp, the movement is wound according to the brandвЂ™s supplied guidelines, and the parts are placed in a temperature controlled enclosure for 12 hours at exactly 23вЊ. The Swiss movement has to be assembled and tested in Switzerland, at least 60 percent of production costs are generated in Switzerland, and the value of 50 percent of the components have to be Swiss made. Only вЂњSwiss MadeвЂќ watches can be submitted for the exam. Here are five things that you need to know about all things COSC.ДЎ.

For example, a Grand Seiko certification requires watches to be the daily rate to be +5 to -3 seconds per day as opposed to the +6 to -4 for COSC certification. ItвЂ™s another thing that there are more stringent certification processes out there.

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While the certification doesnвЂ™t necessarily have the same вЂњwowвЂќ factor it once did, it remains a valuable aspect of how the Swiss watch industry conducts its business and, due to the intense trial each movement goes through, itвЂ™s a tried-and-true way of demonstrating the quality that Swiss mechanical watches are known for. The ContrГґle Officiel Suisse des ChronomГЁtres (COSC) functions as a sort of litmus test for precision throughout the Swiss watch industry.