Jaeger-leCoultre 868 User manual

ENGLISH
Table of Contents
Introduction 21
Accuracy and precautions for use 21
Water resistance 22
“1000 Hours Control” test 24
Technical specifications 25
Movement 26
Functions and displays 26
Use 29
International Guarantee 35
Limited Warranty 39
(United States of America and Canada)
Guarantee for Australia 43
Jaeger-LeCoultre Customer Service 47

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1
2
6
5
3
4
11
10
9
7
8
1Moon phases
2Minute hand
3Aperture indicating the security zone
4Crown
5Date
6Month
7Year
8Corrector
9Second hand
10 Day
11 Hour hand

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Introduction
We would like to thank you for the confidence
you have placed in Jaeger-LeCoultre. Our
Maison has applied all its expertise and exacting
standards to the creation of this model.
We invite you to consult the operating
instructions and hope your Jaeger-LeCoultre
timepiece brings you great joy.
Accuracy and precautions for use
MANUALLY-WOUND OR AUTOMATIC
MECHANICAL WATCHES
The accuracy of watch models with mechanical
movements is determined by the balance
wheel. This oscillates at a rate of 28,800
vibrations per hour. Despite all the care that the
master watchmakers of the Jaeger-LeCoultre
Manufacture have lavished on building and
assembling your watch, its accuracy is subject
to the influence of gravity, magnetic fields,
accidental impacts, and the ageing of the oils.

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The accuracy of a watch is measured by its
regularity of rate in various positions.
Your individual activities could be the cause
of slight irregularities in the working of your
timepiece. If you observe a discrepancy in the
way your watch runs, we advise you to entrust it
to an authorised Jaeger-LeCoultre retailer who
will make the necessary adjustments. Watches
with mechanical movements must not be used
for sports involving significant risk of impact or
abrupt actions, such as golf or tennis.
Water resistance
Your Jaeger-LeCoultre watch is water resistant
up to 5 bar. Its water resistance can be identified
by the symbol and/or the engraving: “5
bar” on the case-back. This means that your
model has been tested at an overpressure of
5 bar, corresponding to an immersion pressure
of 50 metres (1 bar = ±10 metres).
In accordance with the ISO 22810/NIHS 92-20
standard, in order to guarantee the durability
of the watch’s characteristics over time, and

23
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as water resistance may be affected by certain
activities, it is recommended that you:
- have the watch’s water resistance checked
by an authorised Jaeger-LeCoultre retailer
at least once every two years. It is essential
to have such a check carried out each time
your watch is opened, and before any period
in which it is liable to undergo prolonged and/
or regular immersions.
- check when making the purchase that the
bracelet is suitable for the intended use.
- avoid subjecting the watch to excessively
abrupt temperature changes.
- protect the watch from being dropped or
suffering other accidental impacts, and have
the water resistance checked after any severe
impact.
- avoid using the controls, push-piece, or time-
setting crown while under water, or outside
the water, if the watch is not yet dry after
immersion.

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- restore the time-setting crown and the push-
pieces to their normal positions, or where
applicable, close the compression keys, after
every manipulation.
- rinse the watch with fresh water after use in
sea water.
You may use your watch while swimming
as long as you do not exceed the immersion
pressure and do not engage in any water sports
that could cause impacts. This watch is not a
piece of diving equipment and should not be
used as such. Also, note that leather straps are
not suited for aquatic activities.
“1000 Hours Control” test
The Jaeger-LeCoultre Manufacture pays close
attention to the quality and to the final checks
of its watches.
The 1000 Hours Control is a series of internal
qualification tests for each of the models in
our collection, as well as internal tests on the
production of your watch, which go beyond
official timing tests. These tests include checks

25
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of the movement before and after being cased
up in the watch and cover the whole watch
once it has been assembled, in the conditions
closest to daily wear.
The “1000 Hours Control” legend, or the “ ”
seal engraved on the back of the watch certifies
that each of the models from our collection has
successfully undergone all of the qualification
tests, and that your watch has successfully
undergone all of the production tests. These
ensure regularity of rate, resistance to variations
in temperature and atmospheric pressure,
ability to withstand shocks and magnetic fields,
as well as water resistance.
Technical specications
- Self-winding mechanical movement,
Jaeger-LeCoultre Calibre 868.
- 28,800 vibrations/hour.
- Power reserve: approximately 38 hours.

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Movement
Jaeger-LeCoultre Calibre 868.
Functions and displays
The watch oers the following functions:
- Hours
- Minutes
- Seconds
- Date
- Day
- Month
- Year
- Moon-phases
- Perpetual Calendar
- Security zone indication

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The perpetual calendar has a mechanism that
takes into account the length of the current
month (28, 30 or 31 days), and counts a 29th
February every leap year. The date, day of the
week, month, year, and moon phase are therefore
indicated mechanically, without the slightest
need for readjustment until 1 March 2100.
All these are interlinked by the ingenious
mechanism of a genuine, entirely mechanical
programme: merely changing the initial date
thus eects the appropriate changes in all
other functions.
Our time measurement is based on the
Gregorian calendar, i.e. a year of 365 days,
5 hours, 48 minutes, and 46 seconds, or
in decimals, 365.242192 days. In practice,
the yearly excess of just less than a quarter
(0.242192) of a day is corrected by the 29th
February in leap years. The few missing
decimals are then compensated for every 100
years, by excluding 29th February.
For the sake of greater precision, this exclusion
does not take place when the number of

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centuries is divisible by 4. Such is the case for
the years 2000 and 2400 (centuries divisible
by 4), which are both regular leap years.
It is therefore only in the year 2100 that the
programming of your perpetual calendar will
need to be corrected. Until that date, your
watch will count days, months, and decades.
On 1 March 2100, the calendar will indicate
Monday, 29th February, whereas in fact it will
be Monday, 1st March. A watchmaker will then
have to set your watch to the correct date,
together with the moon phase, which varies by
one day in every 122 years.
The Master Ultra Thin Perpetual’s crown allows
you to:
- Wind the watch if it has not been worn for
more than 38 hours.
- Set the desired time.