Patek Philippe 5178, Manual

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Introduction
This self-winding minute repeater is endowed
with “cathedral” gongs that are twice as long as
ordinary ones and thus deliver a particularly full
and sonorous tone. With its white-gold case,
cream colored enamel dial, and applied Breguet
numerals in gold, it flatters the eye as well.
The “cathedral” gongs
To optimize the acoustic quality of a minute-
repeater wristwatch, the “cathedral” gongs
are shaped to encircle the movement not just
once, but nearly twice. This makes them almost
twice as long as conventional gongs. The result:
greater vibrational stability and better acoustic
characteristics.
Reference 5178
Caliber R 27 PS
Self-winding wristwatch
with minute repeater.