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Omega mechanical watches with a certified chrono-
meter movement
Omega watches bearing the chronometer inscription (in
accordance with the certificate issued by your autho-
rised 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.
To earn the title of chronometer, the mechanical move-
ment’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.
Precision tolerances
1,2 3,4 5,6 7,8 9,10
11 12 13 14,15
23°C 23°C 23°C 23°C 23°C
8°C 23°C 38°C 23°C
Temperature
Temperature
Days
Days
Position
Position
U