Patek Philippe 5207/700 Manual Del Usuario página 3

Instantaneous perpetual calendar with aperture displays. Manually wound.
With an extraordinarily large number of parts,
549, to be precise, this timepiece ranks among
Patek Philippe's most complicated wristwatches.
The case flanks and the minute-repeater slide are
artistically hand-engraved. The slightly cambered
sapphire-crystal glass protects a dial that gives the
perpetual calendar an exceptionally unique face.
The apertures for the day, date, and month are ar-
ranged along an arc between 10 and 2 o'clock. The
subsidiary seconds dial is positioned at 6 o'clock
and accommodates the lunar disk in the charac-
teristic moon-phase cutout.
Reference 5207/700
Caliber R TO 27 PS QI
Wristwatch with minute repeater. Tourbillon.
Each of these little discoveries by themselves
delight watch connoisseurs, but the big surprise
comes at midnight, when all displays of the perpetual
calendar advance instantaneously and synchronously.
This is not merely a welcome function, it is also
an extremely challenging additional complication
based on the flawless interaction of 212 individual
parts. Patek Philippe's caliber engineers invested
five years in the development of this ingenious
mechanism to assure that the disks for the day,
the date, the month, and the leap-year cycle really
switch to the next calendar day simultaneously and
at the same time. The core of their invention is
a mechanism consisting of levers and complex
program cams for which two patent applications
were filed.