Accuracy
Mechanical models with manual or automatic
winding
The precision of the mechanical models is determined by the
balance. The latter performs 21,600 or 28,800 vibrations per
hour depending on the model (see technical characteristics).
Despite all the care that the Jaeger‑LeCoultre master‑
watchmakers have lavished on making and assembling your
watch, its accuracy is subject to the influence of gravity,
magnetic fields, shocks, as well as ageing of the oils. This
accuracy is measured by its rate regularity in various positions.
The nature of your temperament and of your daily activities
may cause slight variations in timekeeping. If you were to
notice that your watch is running slow or fast, we advise you
to take it to an approved Jaeger‑LeCoultre retailer, who will
make any necessary adjustments.
Quartz models
The quartz models are accurate to within 2 to 3 minutes
per year.
Jaeger‑LeCoultre quartz watches contain a battery
and electronic components. When performing
maintenance, your official Jaeger‑LeCoultre Service
Centre or your authorised Jaeger‑LeCoultre retailer
will take charge of their recovery and disposal in accordance
with the standards in force.
Water resistance
Jaeger‑LeCoultre Master Tourbillon watches are water‑
resistant to 5 bar/atm. This property can be identified by
the
symbol engraved on the case‑back. This means
that you can use your watch during short swims or when
diving in from the edge, but not from a diving board. Nor
should it be used for undersea diving or for sports where
there are significant risks of hard knocks, such as windsurfing
and waterskiing. Please also note that leather straps are not
suitable for aquatic activities.
Furthermore, it is essential to have your watch’s water‑
resistance checked by an authorised Jaeger‑LeCoultre retailer
at least once every two years, and definitely before any period
in which it will undergo prolonged and/or regular immersion.
The «1000 Hours Control» test
by Jaeger‑LeCoultre
Jaeger‑LeCoultre subjects each of its watches to the rigourous
“1000 Hours Control” test programme. Unique in its kind,
this test consists of 1000 hours of comprehensive, stringent
checks.
The “1000 Hours Control” seal or marking affixed or engraved
on the back of your watch certifies that it has undergone
this observation programme in our laboratories and has
passed all the tests, relating to rate regularity, temperature
and atmospheric pressure, resistance to impacts and magnetic
fields, as well as water‑resistance. Your watch is therefore
capable of withstanding the trials awaiting it in everyday life
when you wear it on your wrist.
The criteria of the “1000 Hours Control” programme go far
beyond the official timekeeping test standards, which concern
only part of the movement. Jaeger‑LeCoultre tests not only
the movement before casing it within the watch, but also the
watch as a whole.
Technical characteristics
‑ Automatic winding mechanical movement,
Calibre 978.
‑ 28,800 vibrations/hour.
‑ Power reserve : approximately 48 hours.
Movement
Jaeger‑LeCoultre Calibre 978.
M
aster
t
ourbillon
‑ English
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