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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 COSC (Swiss Offi cial Chronometer Testing Institute), a neutral
and independent body which individually tests each movement according to the pre-
scriptions in force.
The certifi cation test for wristwatches with sprung balance oscillators, according to
standard ISO 3159, consists of observing each movement for 15 days and 15 nights, in 5
positions and at 3 diff erent temperatures (8°C, 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 fi tted with an additional mechanism for measurement of the dura-
tion of an event. A chronograph is not necessarily chronometer-certifi ed, but all Breitling
chronographs bear the much-coveted title of "chronometer".
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PREPARATION FOR USE
WINDING – TIME-SETTING
NB : mechanical watches with a date indicator window are equipped with a
complex mechanism that is set into motion between 8 pm and 3 am. Its is
therefore vital to avoid adjusting the calendar or moving the time backwards
during this period.
1. Unscrew the water-resistant crown anti-clockwise. Wind the
watch through approximately 40 clockwise turns of the crown.
2. Pull the crown out to position 2, turn it counterclockwise to adjust
the calendar to the day prior to the activation date.
3. Pull the crown out to position 3. Turn the hands past midnight so
as to make the calendar jump to the correct date. Then adjust
the hour and minute.
4. Push the crown back to position 1. Press it gently, turning it gently
clockwise, then tighten it again until you feel some resistance.
Do not force!
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