A COSC certified quartz chronometer is tested for 13 days, in one position, at 3 different temperatures and 4 different relative humidity levels. Measurements are compared with a time base established by two independent atomic clocks synchronized on GPS time.All Rolex movements are officially certified as a 'Chronometer', meaning. that they have passed the COSC tests and been awarded an official certificate attesting to their. precision.Each movement is submitted to COSC (the Swiss Official Chronometer Testing Institute) for its official certification, after 15 days and 15 nights of testing involving seven eliminating criteria in five static positions and at three temperatures. All Rolex movements obtain this official Swiss chronometer certificate.
What is the Rolex chronometer test : The Superlative Chronometer certification puts assembled Rolex watches through a battery of tests that simulate conditions watches encounter in real-world use. Testing includes exposures to temperatures between -10 and +50 degrees Celsius, humidity levels of 95%, and magnetic fields up to 10,000 gauss.
Is COSC certification worth it
The COSC is vital to Swiss watchmaking as it ensures a level of excellence is maintained within the industry. Only the most accurate and well-made timepieces receive the COSC Certification, meaning that only about 6% of all Swiss watches exported are certified.
How accurate is an officially certified chronometer : Accuracy of a Master Chronometer is independently certified at between 0 and +5 seconds per day variance, which ensures the watch will never lose time and the certified accuracy is superior to that of the general COSC certified chronometers which are between -4 and +6 seconds per day.
An official Rolex remains an incredible timepiece and will still appeal to buyers without the papers. As such, you can sell a Rolex without the guarantee card. While the absence of a guarantee card will likely reduce the watch's value, the impact might be more negligible than you think.
Watch authentication, especially luxury brands like Rolex, is crucial for several reasons, ensuring timepieces' integrity, value, and history. It prevents counterfeit sales, protects investments, and maintains the watch's heritage, making it essential for collectors and enthusiasts.
Is Patek Philippe COSC certified
Patek Philippe developed their own testing methods that allow their watches to consistently meet above COSC specs and earn their special Patek Philippe Seal.Rolex watches are “Superlative Chronometers” and keep very accurate time for mechanical watches, in fact they guarantee plus or minus 2 seconds per day.A chronometer is any timepiece with a movement which has undergone and passed accuracy testing by the Contrôle Officiel Suisse des Chronomètres, or COSC, to within -4 or +6 seconds per day variance for mechanical wristwatches.
COSC-certified watches have an average accuracy of -4/+6 seconds per day. On the other hand, Quartz movements go through a similar test albeit only last 13 days. In addition, it is also tested at three different temperatures (— 8°, 23°, and 38°C) but with 4 different humidity levels.
Is A COSC watch worth it : COSC-certification can also add value to a watch so if you are looking for an investment timepiece, choosing a chronometer watch is a good place to start. Only around six percent of all Swiss watches are certified by COSC so that alone places you in an exclusive group of watch owners.
Is it dumb to buy a Rolex without papers : The papers are crucial for collectors as they add to the watch's provenance and value. They are especially important for vintage Rolex watches, where the original papers can significantly increase the watch's value.
Can I sell a Rolex without certificate
An official Rolex remains an incredible timepiece and will still appeal to buyers without the papers. As such, you can sell a Rolex without the guarantee card. While the absence of a guarantee card will likely reduce the watch's value, the impact might be more negligible than you think.
Since 2015, every Rolex watch is guaranteed to be accurate within -2/+2 seconds per day, and almost all models bear the “Superlative Chronometer Officially Certified” label on the dial.Today, every single watch in Rolex's catalog contains a chronometer-certified, in-house movement. Even modern Cellini watches are certified chronometers even though their dials do not include the familiar “Superlative Chronometer Officially Certified” text that appears on all the other Rolex watches.
Why is chronometer so expensive : Chronometer certification comes at a cost, making these watches more expensive than regular timepieces. However, their precision is higher, offering a reliable and accurate measure of time.