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3
Precision tolerances
Mechanical watches
OMEGA
mechanical watches with a certified chronome-
ter movement
OMEGA watches bearing the chronometer inscription (in accor-
dance with the certificate issued by your authorised OMEGA retai-
ler) 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 move-
ment for 360 consecutive hours, during which it is placed in the
five common wrist positions and exposed to three different tem-
peratures.
Days
Position
Temperature
Days
Position
Temperature
To earn the title of chronometer, the mechanical movement's ave-
rage 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.
34
1, 2
3, 4
23°C
23°C
11
12
8°C
23°C
U
5, 6
7, 8
23°C
23°C
13
14, 15
38°C
23°C
9, 10
23°C
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