Specifications Patek Philippe World Time watch Ref. 5131

World Time watch – Ref. 5131 in 18K yellow gold
Movement: Caliber 240 HU
Self-winding mechanical movement, display of 24 time zones,
day/night indicator
Diameter: 27.50 mm
Height: 3.88 mm
Number of parts: 239
Number of jewels: 33
Power reserve: Max. 48 hours
Winding rotor: Mini-rotor in 22K gold, unidirectional winding
Balance: Gyromax
Frequency: 21,600 semi-oscillations/hour (3 Hz)
Balance spring: Flat
Balance spring stud: Movable
Functions: Two-position crown:
- Pulled out: to set the time
- Pushed in: to wind the watch
Time zone correction
button at 10 o’clock: Synchronized clockwise advance of the hour hand in one-hour
increments and counterclockwise rotation of the city and 24-hour
disks in 15° increments. This correction takes place without
affecting the rate of the movement or the progression of the minute
hand (Patent No. 99124527.5 dated December 9, 1999).
Displays: Hours and minutes
City disk
24-hour disk with day/night indication by color and sun/moon
symbols
Features
Case: 18K yellow gold with engraved Patek Philippe signature at 12
o'clock and Genève at 6 o'clock
Screwed back in 18K yellow gold with sapphire-crystal window
Water-resistant to 30 meters
Dimensions: Diameter: 39.50 mm
Height: 10.61 mm
Width between lugs: 21 mm
Continued 5
Dial: 18K yellow gold, center of dial with world map in hand-crafted
cloisonné enamel
Disks:
- Black printed city disk with new italic face
- 24-hour disk with day/night indication by color and sun/moon
symbols (blue day numerals on silvery background, white night
numerals on blue background)
Hands Ring-shaped hour hand in 18K yellow gold
Dauphine minute hand in 18K yellow gold
Strap: Alligator with rectangular scales, hand-stitched, matt chocolate,
fold-over clasp in 18K yellow gold