amanico[JLC Moderator]
404479
Master 1000 Hours Control. The content in one scan.
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
You missed...
By: watchme : March 19th, 2014-07:08
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...
Transparency Still Has Value
By: Tim_M : March 20th, 2014-05:51
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...