Jaeger-LeCoultre submits all its watches to the stringent “1,000 Hours Control”, a unique battery of comprehensive and rigorous tests lasting a full 1,000 hours. The “1,000 Hours Control” seal or legend placed or engraved on the back of your watch certifies that the latter has undergone this programme of observation in our laboratories and has successfully passed all the tests relating to regularity of rate, temperature, atmospheric pressure and resistance to shocks and magnetic fields, as well as water-resistance trials. Your watch is thus capable of withstanding the daily stresses and strains that await it when worn on your wrist. The criteria of the “1,000 Hours Control” programme considerably exceed the standards of official timing tests, which deal only with part of the movement. Jaeger-LeCoultre tests not only the movement prior to its being cased up in the watch, but also the watch as a whole.