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Omega 1861 Manual

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English
Operating instructions2
Self-winding GMT & GMT Chronograph
SECOND TIME ZONE (calibre 1128 - fig. VI)
Thanks to the '24-hour' hand with its triangular point, travellers can
read the time back home at a glance on the 24-hour scale on the
rotating bezel. In order to do so, the triangle on the bezel must point
to 12 o’clock on the dial.
The bi-directional turning bezel (calibre 1128) allows a third
time zone to be read. To do so, the bezel must be turned so that the
'24-hour' hand points to this third time zone on the bezel. When read
off against the scale on the bezel, the '24-hour' hand will then indi-
cate the time in this third time zone.
In order to read the time back home, the triangle of the bezel must be
returned to point to 12 o’clock on the dial.
SECOND TIME ZONE
(calibre 2628 - fig. VII, calibre 3603 - fig. XX)
Thanks to the '24-hour' hand with its triangular point, travellers can
read the time back home at a glance on the 24-hour scale at the
centre of the dial.
Chronograph functions (calibre 3603 - fig. XX)
• Pusher A: start – stop, start – stop, etc.
Timing to within 1/8th of a second for up to 12 hours.
• Pusher B: reset (after stopping).
Note: never push the chronograph’s two pushers (A and B) simulta-
neously (calibre 3603).
j
Mechanical watches
Precision tolerances3
OMEGA mechanical watches with a certified chronometer
movement
OMEGA watches bearing the chronometer inscription (in accordance
with the certificate issued by your authorised 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 movement’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.
U
9, 101, 2 7, 83, 4 5, 6
13
23°C
38°C
12
23°C
23°C
14, 15
23°C
23°C
11
23°C
8°C
23°C
Temperature
Temperature
Days
Days
Position
Position
OMEGA_V12-I.indb Abs1:34-Abs1:35OMEGA_V12-I.indb Abs1:34-Abs1:35 28/12/09 18:30:3728/12/09 18:30:37
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