OMEGA SA
WORLD SERVICE ORGANIZATION
GT-19-C-013-E - C - 1538
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General information for calibre 1538
Seconds wheel
Version 1538A
Version 1538B
Former execution
New execution
7221441227
7221538B30027*
Improve the accuracy of
the seconds hand jump.
Ref. 7221538B300273
New version from date code: 47/04
Wheel train bridge
Version 1538A
Version 1538B
Former execution
New execution
7221538B1004807
7221538B1004807
A magnet to stabilise the
seconds wheel has been added.
New version from date code: 10/04
Improvement of the seconds jumps on calibre 1538D
In order to better meet our customers requirements, the jump
of the seconds hand on calibre 1538D has been further
improved.
Technical modi
fi
cations on version
«D»
Calibre 1538D
Application :
When repairing a version D, the new components must be
used systematically.
When ordering one of the two components individually, an
automated order of KIT ref. 7221530D9999* is issued.
It comprises:
Seconds wheel ref. 7221530D30027*
Intermediate wheel ref. 7221530D30012
Goal of the technical modi
fi
cation:
Further improve the accuracy of the seconds hand jump in
relation to the dial markers, including a reduction of the
wheel engagement play.
Interchangeability
New and old wheel executions must not be mixed; there is a
serious risk of blocking
.
Calibre version 1538C was produced with old and new
wheel executions. We therefore suggest to systematically
using new wheels from the KIT ref. 7221530D9999*.
Version D
Kit Ref. 7221530D9999*
New seconds wheel (yellow) and
intermediate wheel (grey).
Reduction of the play of the wheel engagement
to improve seconds hand jump.
New version from date code: 42/07
The policy for local repair is:
We recommend a movement exchange (see Working
Instruction no. 31).
In case of local repair, the exchange or replacement of
spare parts must be made according to the movement
version (see engraving on main plate). Example: On a
movement calibre 1538B, the parts to exchange or repla-
ce are those mentioned under version 1538B.
Technical modi
fi
cations on version «B»
Calibre 1538A + 1538B
Application :
When repairing a version A or B, the new components
must be used systematically.
Goal of the technical modi
fi
cations:
Improve the accuracy of the seconds hand jump in relation
to the dial markers.
Version A / B / C
Ref. 722143030012
Ref. 7221538B30027*
Old seconds wheel (grey) and
intermediate wheel (yellow)
