Congratulations, you have successfully completed the watchmaking terminology theme on the HH Academy application. Find here the essential knowledge,
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WATCH COMPONENTS
Crystal
Case
Crystal
case back
Crown
Bezel
Hallmark
Marker
Reference
Origin
Horns
FRONT
BACK
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WATER RESISTANCE
Water-resistant watches are not intended for scuba diving
This would seriously damage the mechanism. If you wish to perform scuba diving
with your watch, you will need to use a diving watch.
A water-resistant watch can cope with atmospheric humidity and dust
A water-resistant watch protects against atmospheric humidity, dust and the wearer’s perspiration.
It should be possible to immerse a water-resistant watch up to 20 meters
If there is no specific indication from the manufacturer, a water-resistant watch is
guaranteed up to 2 bars, which corresponds to a depth of 20 meters below the surface of the water, but not more.
THE CHRONOMETER
All chronometers are not necessarily chronographs
A chronometer is a high-precision watch, displaying seconds, whose movement has
been tested by an official and neutral organisation according to the ISO 3159 standard. A chronograph is an additional mechanism used to measure the length of an
event. Even though a chronograph can be used to measure a length of time, it can
only be called a chronometer if it has obtained an official certificate.
The COSC is a Swiss institution that tests chronometers and issues their certificates
The COSC (Contrôle Officiel Suisse des Chronomètres) is a non-profit-making
organisation, founded in 1973, which tests watches and issues timekeeping accuracy
certificates.
The COSC certifies about 1.7 million movements per year
The COSC certifies about 1.7 million movements per year, which represents only 5%
of the annual Swiss watch production. Few watches obtain the certificate of precision
of the COSC because of its strict requirements.
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THE DIVING WATCH: MAIN CRITERIA
Waterproof
to 100 meters minimum
Shock-resistant
(ISO 1413 norm)
Antimagnetic
(ISO 794 norm)
Unidirectional
rotating bezel
anti-clockwise
Movement’s
function indicator
(small second…)
Detailed
scale of the first 15 minutes,
then an indication every 5 minutes
Luminescent
marker at noon
Reading
of the time, the function
indicator and the bezel in total darkness
at any depth, and up to a maximum
of 25 centimeters of distance
In order to be ISO 6425 certified, the water-resistant watch must meet all of these and
other criteria (such as resistance to thermal shock, salt water, etc.)
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