On the occasion of
the 50th anniversary of the ISO 3159 standard, the COSC (Contrôle
Officiel Suisse des Chronomètres) is introducing a new certification.
Designed to address today’s technical realities and the evolving expectations
of both manufactures and clients, it builds on the existing standard. Conceived
as a complementary extension rather than a replacement of the current
certification, this new distinction strengthens performance requirements
through the following: test conducted on the finished watch; a reduced rate
tolerance of 6 seconds per day (-2+4 s/ day); magnetic resistance tested at 200
Gauss; verification of the stated power reserve.
Watches that meet all of
these criteria will be awarded the title: Excellence Chronometer Certified.
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