Before being admitted to the outside world, Jaeger-LeCoultre watches have to pass the 1000 Hours Control with flying colours. This series of extremely rigorous tests is much stricter than the standards imposed by the Bureaux du Contrôle Officiel Suisse des Chronomètres, the COSC, which check the movements without their cases and without complications. Whereas the Manufacture tests and certifies finished watches, reproducing the conditions of real life wear. For 1000 hours - nearly 6 weeks - all the watches have to undergo a series of tough trials. The 1000 Hours Control has established a new standard of watch quality. The buyer of a Jaeger-LeCoultre watch can thus rest assured that he owns a very high quality product of a centuries-old tradition and a long and meticulous process, in which no detail has been overlooked, and tested to the most exacting standards.