Jaeger-LeCoultre

Marcus Hanke
[PuristSPro Moderator]
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My problem with all these factory-indigenous test procedures ...

... 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 6 different positions simulating conditions of regular wear." - what does this mean? Is the accuracy performance measured at full mainspring tension? At half? Is it repeated, how often, in which intervals? Or is the measurement based on an average value, like the COSC? What are the limit values, in all positions, and so on.

I, too, was quick to join the concert of critical voices regarding the COSC, until I realized that the only result of it is a complete loss of comparability regarding the performance of different manufacturers' products, and also a loss of impartiality. I now consider the manufacturers to be the wrong place to produce an objective evaluation of a watch's or movement's performance. Some kind of independent and objective authority has to test the watches. This needs not to be the COSC, necessarily. But until now, there is no real alternative.

Marcus