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YOUR BREITLING CHRONOMETER
A chronometer is a high-precision instrument that has successfully passed the
entire battery of tests imposed by the COSC (Swiss Official Chronometer
Testing Institute), a neutral and independent body which individually tests
each movement according to the prescriptions in force.
The certification test for wristwatches with sprung balance oscillators,
according to the ISO 3159 norm, consists of observing each movement for
15 days and 15 nights, in 5 positions and at 3 different temperatures (8°, 23°C,
38°C). In order to earn the prestigious chronometer label, a movement’s
performances must meet 7 very strict criteria, including a daily variation in
rate ranging between only –4/+6 seconds.
The term “chronometer” should not be confused with that of “chronograph”,
which is a complicated watch fitted with an additional mechanism enabling
the measurement of the duration of an event. A chronograph is not neces-
sarily chronometer-certified, but all B
REITLING
chronographs carry the much-
coveted title of “chronometers”.
PREPARING THE WATCH FOR USE
WINDING – DATE ADJUSTMENT – TIME-SETTING
Nota bene:
mechanical watches endowed with a date, day,
month or moon-phase indicator are equipped with a complex
mechanism that is set into motion between 8 pm and 3 am. It is
therefore vital to avoid adjusting the calendar or moving the
time backwards during this period.
1. Wind the watch by 40 clockwise turns of the crown.
2. Pull the crown to position 3 to adjust the hour and the
minute, while referring to the 24-hour display to avoid
any confusion such as between 10 am and 10 pm.
3. Place the crown in position 2. Turn it anticlockwise to
show the right month (the month indication changes
with each full rotation of the hand). Then position
the hand on the exact date.
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