Precision Tolerances - Mechanical Watches/Quartz Watches - Omega 1376 Operating Instructions Manual

3 Precision tolerances
Mechanical watches
OMEGA mechanical watches with a certified chronometer
movement
OMEGA watches bearing the chronometer inscription (in accordance
with the certificate issued by your authorised OMEGA retailer) are
high-precision timepieces that have passed the precision tests of the
Official Swiss Chronometer Testing Institute (Contrôle Officiel Suisse
des Chronomètres, COSC).
This neutral and independent body individually tests each movement
for 360 consecutive hours, during which it is placed in the five common
wrist positions and exposed to three different temperatures.
Days 1, 2 3, 4
Position
Temperature
23°C 23°C
Days 11 12
Position
8°C 23°C
Temperature
To earn the title of chronometer, the mechanical movement's average
daily variation in rate must be between -4/+6 seconds per day, or a
precision of 99.99%, the highest precision attainable by a mechanical
movement.
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5, 6 7, 8 9, 10
23°C 23°C 23°C
13 14, 15
38°C 23°C
3 Precision tolerances
Quartz watches
The precision of a mechanical movement depends on the individual
habits of the wearer and can therefore vary. A qualified OMEGA
watchmaker can adjust the precision of a watch to within the OMEGA
tolerances, which are from -1 to +6 seconds per day.
Other OMEGA mechanical watches
Watches without chronometer certification (COSC) have average
precision tolerances of between -1 and +11 seconds per day.
The precision of a mechanical movement depends on the individual
habits of the wearer and can therefore vary. A qualified OMEGA
watchmaker can adjust the precision of a watch to within the OMEGA
tolerances.
Quartz watches
All OMEGA quartz movements are produced in accordance with
OMEGA's highly renowned procedures and quality standards. Ambient
temperature may affect the precision of quartz movements, which can
lead to variations of between -0.5 and +0.7 seconds per day.
Quartz watches with thermocompensation
This movement is fitted with an electronic module that compensates
for the effects of temperature on the movement's precision. These
watches are accurate to within +/- 0.055 seconds per day.
The precision of a mechanical watch cannot be compared to that of a
quartz watch, given that the two are based on different technologies.
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