Jaeger-LeCoultre

We often discussed the 1000 Hours Control tests, and their difference with the COSC. I scanned the page of a 2002 Catalogue, where it is all explained. Here it is: Have a good read. Nicolas...  

... is, that unlike the much-criticized COSC tests, the manufacturers rarely disclose the exact test criteria and limit values the watches/movements must not surpass. The text reproduced is typical for that. "The measurement is based on tests performed in... 

I will try to have more précisions on the 1000 Hours Control. As I said, this is an extract I found in a JLC Catalog. Nonetheless, it is true that it would be better to have an external authority to do these tests. But if the outcome is less good than the... 

What I am complaining about is the lack of transparency, when all manufacturers strictly keep to their own individual test procedures, which might - not necessarily have - be chosen to perfectly match the characteristics of their own products. However, we... 

Apparently, there is an effort to establish a new an independent Swiss testing institute. I will try to get more information about this. Marcus

in the end the best kind of independent and objective authority is the customer and this is the ultimate alternative. Is it not? I mean, we should let the watchmakers do the tests they see fit for the purpose of their products, if the customer is satisfie... 

pages 187 & 188, where JLC defends the reason for the "Master Control" test, and it wasn't just about accuracy. So, while I agree on one hand with Marcus' analysis of "loss of comparability," JLC's reputation is at stake. It is, also, why PP abandoned... 

Hi, Personally, there's no good reason why a company shouldn't publish the standards for its internal tests. The only reasons would be ones that are a disservice to consumers, namely, the tests are not rigorous, or the results are not impressive. Rolex CO... 

I wonder how the test is performed on hand winding watches. So much here seems to require automatic.

more thing reading this article. That is, 800 rotations in two hours is not necessary the same as 400 rotations per hour!? Otherwise it would be stated;) Joke aside, very interesting and from my experience, JLC "normal" wrist watches are definitely the mo...