Patek Philippe World Time Chronograph, Manual

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DISPLAYS
Hour hand
Minute hand
Chronograph hand (sweep seconds)
City disk
24-hour disk (day/night indication in colors and
sun/moon symbols)
Subsidiary dial:
30-minute counter
CROWN
1 Manual winding
2 Setting the time
PUSHERS
Time-zone selection
Synchronized one-hour corrections of the hour
hand (clockwise) and 1∕24th increments (15°) of the
city disk and 24-hour disk (counterclockwise)
Chronograph start and stop
Chronograph reset and flyback function
MOVEMENT
• Caliber CH 28-520 HU
• Self-winding
• Flyback chronograph
• World Time
• Diameter: 33 mm
• Height: 7.97 mm
• Number of parts: 343
• Number of jewels: 38
• Power reserve:
min. 50 hours – max. 55 hours
• Winding rotor:
central rotor in 21K gold,
unidirectional winding
• Balance: Gyromax®
• Frequency:
28,800 semi-oscillations/hour (4 Hz)
• Balance spring: Spiromax®
• Patek Philippe Seal