The Octa five-day automatic Calendar
annual calendar is the third complication to be integrated within
the Octa automatic winding calibre, defined as the first automatic
winding movement to ensure a minimum power-reserve of 120 hours
(five days) enabling extremely précise time measurernent even
when not worn.
The originality of each of the Octa complications is imposed by
an identical mainplate for all models within the Octa collection.
The mechanism must adapt to the milling and drilling required
for other complications and must also be inserted within a thickness
of just 1 millimetre.
Once main, François-Paul Journe has achieved the feat of integrating
within this five-day automatic calibre a complication as significant
as an annual retrograde calendar, while maintaining the dimensions
of the mechanism at :30 mm in diameter and 5.7 mm thick.
The calendar which displays the day and month through two separate
windows advances instantaneously and is self-adjusting for the
months of 29. 30 and 31 davs.
The Octa annual calendar automatically inoves from month to month.
It only needs to be advanced manvally ai the end of February,
three years out of four. For non leap-years, the calendar must
be moved from Februarv 28th to 29th by a single turn of the crown
and the calendar automatically moves from February 29th to March