Patek Philippe 5959, Manual

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Haute horlogerie at its very finest
Patek Philippe’s caliber CHR 27-525 PS is the world’s
thinnest split-seconds monopusher chronograph
movement with column wheel control: it is a scant
5.25 mm thick. Not least, this record was achieved
thanks to an unusual design approach for the conti-
nuously running 60-minute counter. This innova-
tion not only results in a slimmer silhouette, it also
offsets the torque differences between the running
and stopped states of the chronograph.
The three chronograph wheels (driving, clutch, and
seconds wheels) are another exclusive feature of
the CHR 27-525 PS movement. Their innovative and
patented toothing geometries reduce wear and op-
timize power transmission within the chronograph
mechanism.
The pinnacle of artisanship
The caliber CHR 27-525 PS movement is a clas-
sic split-seconds chronograph construction
with two column wheels that, as always at Patek
Philippe, are crowned by polished caps. The
bridges à l’ancienne are meticulously chamfered,
polished, and decorated with Geneva striping.
Each caliber is hand-crafted one by one by a master
watchmaker in the manufacture’s Haute Horlogerie
ateliers. Practically every component is individually
filed, chamfered, polished, adjusted, and finished.
Subsequently, the watchmaker performs a trial
assembly, the so-called repassage en blanc, to ve-
rify the functional integrity of the movement.
Afterwards, the caliber is completely disassem-
bled again. When all parts have been cleaned,
they are reassembled, lubricated, and fine-tuned.
This ancestral method produces horological mas-
terpieces that exceed the expectations of even
the most discerning aficionados.