Christopher Ward C70 VW4 Limited edition, Owner'S Handbook Manual

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6
THe CosC CerTIfIed CHronomeTer
CosC CerTIfICATIon
To gain chronometer status, watchmakers
submit their swiss movements to CosC,
an independent, non-profit making watch
accuracy verification organisation based
in geneva, to be tested against the
international standards of Iso and dIn.
Certification follows exhaustive testing. In
achieving the coveted status of Certified
Chronometer, a movement must not only be
made from the highest quality components,
but also be the object of special care on
part of the finest horologists and technicians
as it is painstakingly assembled.
only movements which meet the precision
criteria are granted an official certificate.
each uncased movement is individually
tested for fifteen days, in five positions,
at three different temperatures. movements
are fitted with a second hand for tests
and measurements are made daily with
the aid of cameras. Based on all of these
measurements, seven eliminatory criteria
are calculated, each of which must be met.
The exacting and rigorous nature of the
COSC certification process means that the
achievement of Certified Chronometer status
is extremely rare. In fact, of all the watches
produced in switzerland each year,
just 3%
bear the coveted COSC ‘bulletin de marche’
or certificate of watch performance. Which
is why, when you read the words ’Certified
Chronometer’ on a Swiss watch you can be
sure that the movement behind the elegant
dial is a rare example of fine Swiss watchmaking
which is accurate, precise...
and extremely rare .