Patek Philippe 5270 Manual Del Usuario página 13

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is the most advanced caliber among all traditional
chronograph movements.
The addition of a perpetual calendar necessitated
the development of a new calendar cadrature. Two
entire years of development work were invested to
create this mechanism with 182 parts and a height
of just 1.65 mm, and to seamlessly interface it with
the chronograph.
The steel components are immaculately finished
with longitudinally grained f lanks, sublimely
ground surfaces, and chamfered and polished edges.
The wheels and pinions are also meticulously fin-
ished to the highest standards of watchmaking art-
istry: one by one, their teeth are polished by hand
using a rotating hardwood disk. This reduces fric-
tion and wear and improves energy transmission.
The configuration of the dial reflects the classic
face of Patek Philippe chronographs with perpet-
ual calendars: The day of the week and the month
are indicated in a double aperture at 12 o'clock,
and the analog date at 6 o'clock has an integrated
moon-phase display. Subtle differences include the
two small round apertures for the day/night indi-
cator and the leap-year cycle as well as the seconds
subdial and the 30-minute counter whose centers
are positioned slightly beneath the horizontal axis
through the middle of the dial. So despite the con-
siderable number of eleven indications, the dial is
characterized by clarity and easy legibility.