Patek Philippe Caliber R CH 27 PS QI Mode D'emploi page 9

CHANGING THE CASE BACK
Your watch comes with a sapphire-crystal case
back and a interchangeable solid metal back. Only
qualified master watchmakers at the Patek Philippe
workshops in Geneva are authorized to exchange
the backs.
PATEK PHILIPPE SEAL
The Patek Philippe Seal is a global emblem of
quality that applies to the completed and fully cased
watch. It covers the movement, the case, the dial,
the hands, the pushers, the straps and bracelets,
the clasps, as well as all other components that
contribute to the accuracy and aesthetic appeal of
a watch. It takes technical, functional, and design-
related aspects into account and also covers the
visual appearance of the watch, its rate accuracy
and dependability, as well as the quality of the
customer service to which its owner is entitled. It
encompasses the entire know-how and the unique
facets that govern the development, production,
and long-term maintenance of an exceptional
timepiece.