The Octa five-day automatic chronograph
with large date
Whether fitted with a chronograph, an annual calendar or with
a powerreserve indicator, the Octa automatic five-day movement
always measures 30mm x 5.7mm. In François-Paul Journe's most evolved
construction, a single complex chassis integrates a variety of
complications without changing its form or size. The ultra-thin
chronograph work, for example, is built into the movement. This
compact construction, without bolt-on modules, results in a robust
and stable movement.
It is also the first automatic movement with a power reserve that
maintains precision timekeeping for five days (120 hours) off
the wrist. The Octa chronograph features zero restart (retour-en-vol)
as well as zero stop functions and a 60-minutes register.
The watch displays Journe's patented date in separate large numerals
and the hours, minutes and small seconds on Journe's trademark
The 1mm chronograph Journe has designed an ultra-thin version
of the classic column-wheel chronograph, to fit into a 1mm-high
space under the dial. This space is shared by the twin concentric
discs of the large date display. The column-wheel has been flattened
into a cam-wheel. Its profiled rim, instead of columns, acts on
the chronograph levers.
A single sliding lever zeroes both the chronograph seconds and
minutes, disengaging their brakes as it strikes specially profiled
heart-pieces to zero the hands. These two innovations allow the
entire chronograph work to be reduced to three mechanical levels.