Patek Philippe CH 28-520 C/528, Manual, Page: 8 / 61

13
MAINTENANCE
12
CERTIFICATE OF ORIGIN
Your watch is delivered with a certificate of origin
that indicates the movement and case numbers. The
certificate is valid only if it is dated, signed by an
Authorized Patek Philippe Retailer, and completed
with your name. It guarantees the authenticity of
your watch and validates your warranty privileges
for a period of two years after the date of sale. The
unique movement and case numbers of each watch
are transcribed into the workshop journals. With
this information, you may have yourself entered
in the Patek Philippe Register of Owners and will
obtain the
International Patek Philippe Magazine
free
of charge.
PATEK PHILIPPE SEAL
As an all-encompassing hallmark of quality,
the Patek Philippe Seal applies to the entire
watch, including the movement, case, dial,
hands, pushers, strap, and clasp as well as to all other
facets that contribute to the precision and aesthetic
perfection of the timepiece. It covers the technical,
functional, and aesthetic factors, but also rate accu-
racy, dependability, and customer service quality.
Additionally, it reflects the maker’s know-how and
all other assets needed for the development, produc-
tion, and long-term maintenance of an extraordinary
timekeeping instrument.
DATE CORRECTION
To set the date , actuate the correction push piece
at 8 o’clock as many times as needed to display the
current date.
CHANGING THE STRAP
If your watch was delivered with two straps, please
note that only an Authorized Patek Philippe Retailer
or an Authorized Patek Philippe Service Center is
qualified to change the strap. Also, avoid pressing
the second strap’s metal catches against the case, so
as not to scratch the bezel.