Caliber R 27 PS QR

Self-winding with Minute Repeater

DESCRIPTION

Self-winding with Minute Repeater.
This caliber is distinguished by a chime of exceptional sound quality.
It took Patek Philippe extensive research efforts in metallurgy and acoustics to achieve a sound of such perfection and unrivalled purity.
On demand, the minute repeater will strike the hours, the quarter-hours, and the minutes which have elapsed since the last quarter hour.
One hammer strikes the number of hours on a low-pitched gong. Then, two hammers consecutively strike the number of quarter-hours on the low-pitched gong and the high-pitched gong. Finally, the second hammer strikes the high-pitched gong for a count of the number of minutes that have elapsed since the last quarter hour. It takes the largest number of strikes – 32 in total – to indicate the time at 12:59. Twelve low-pitched strikes, three high-low double strikes, and 14 high strikes.

Technical data

• Minute repeater
• Perpetual calendar with retrograde date hand
• Day, month, leap year in apertures
• Moon phases
• Seconds subdial
• Overall diameter: 28 mm
• Height: 7.23 mm
• 39 jewels, 12 bridges
• Balance: Gyromax
• Vibrations per hour: 21'600
• Power reserve: 48 h max.
• Number of parts: 515