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 cambe-
red sapphire-crystal glass protects a 18K dial that
gives the perpetual calendar an exceptionally
unique face. The apertures for the day, date, and
month feature mirror-polished rose gold frames
and are arranged 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 characteristic moon-phase cutout. Each
of these little discoveries by themselves delight
watch connoisseurs, but the big surprise comes at
midnight, when all displays of the perpetual calen-
dar 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.
Reference 5207
Caliber R TO 27 PS QI
Wristwatch with minute repeater. Tourbillon.
Instantaneous perpetual calendar with aperture displays. Manually wound.
Rose gold.
Summary of Contents for 5207
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