from the press releaseTechnical data
Patek Philippe Advanced Research Perpetual Calendar Ref. 5550P
Movement: Caliber 240 Q Si
Ultra-thin self-winding mechanical movement. Perpetual calendar with
analog displays for the day of the week, date, month, and leap-year
cycle. Moon phases and 24-hour display.
Diameter: 27.50 mm
Height: 3.88 mm
Number of parts: 281
Number of jewels: 25
Power reserve: Max. 70 hours
Winding rotor: Minirotor in 22K gold, unidirectional winding
Frequency: 21,600 semi-oscillations per hour (3 Hz)
Oscillomax®: Balance: GyromaxSi® (in Silinvar® and 24K gold)
Balance spring: Spiromax® (in Silinvar®)
Escapement: Pulsomax® (lever and escape wheel in Silinvar®)
Displays: Hours and minutes from the center
Day of week and 24-hour dial at 9 o'clock
Month and leap-year cycle at 3 o'clock
Analog date and moon-phase aperture at 6 o'clock
Functions: Two-position crown:
– Pulled out: To set the time
– Pushed in: To wind the watch
Corrector push pieces: Day at 9 o'clock
Date between 11 and 12 o'clock
Month between 12 and 1 o’clock
Moon phase at 6 o'clock
Setting stylus in ebony and 18K white gold delivered with the watch
Hallmark: Patek Philippe Seal
Features
Case: 950 platinum
Snap-on sapphire-crystal back with integrated loupe; diamond of approx.
0.02 ct. between the lugs at 12 o'clock
Water resistant to 30 m (3 bar)
Case dimensions: Diameter: 37.20 mm
Height: 8.80 mm
Overall height incl. loupe: 10.10 mm
Width between lugs: 19 mm
Dial: Silvery gray, vertical satin finish, “Advanced Research” inscription 12 obus hour markers in 18K rose gold with luminous coating
Hour and minute hands: Leaf-shaped, in 18K rose gold, with luminous coating
Hands for 24-hour display, leap-year cycle, date, day of week, and month:
Leaf-shaped, in 18K rose gold
Strap: Hand-stitched alligator leather with large square scales, shiny chocolate brown, platinum foldover clasp