SPECIFICATIONS
Brand: Patek Philippe
Model: Annual Calendar Chronograph
Reference Number: 5960P-015
Movement: Automatic
Condition: Mint
Gender: Men’s
Time Period: 2010
Box: No
Papers: Extract from Patek Philippe Archives
THE CALIBER
Caliber: CH 28-520 IRM QA 24H
Jewels: 40
THE CASE
Case Material: Platinum 950, diamond at 6 o’clock
Case Diameter: 40.5 mm
Thickness: 13.5 mm
Waterproof: 80 ft./ 25 m./ 2.5 ATM
Bezel Material: Fixed platinum
Glass: Sapphire Crystal with antireflection-coating
Caseback: Solid
Dial: Two-tone blue and silvery gray, azuré subsidiary dial
Dial Numerals: 18K white gold applied 8 stick hour indices and 11 Superluminova luminous dots
THE BRACELET / STRAP
Bracelet Material: Brown Leather
Buckle: Fold-over
Buckle Material: 18K white gold
THE FUNCTIONS
Annual calendar, hours, minutes, center sweep seconds (chronograph hand), day aperture between 10 and 11 o’clock, date aperture at 12 o’clock, month aperture between 1 and 2 o’clock, 55-hour power reserve indicator at 12 o’clock, 12 hours, and 60-minute subsidiary “mono-counter” chronograph dial at 6 o’clock, flyback, 24-hour display (day/night) at 6 o’clock
FURTHER READING
18K white gold applied leaf-shaped hour and minute hands with Superluminova luminous coating
Baton-style chronograph hand in sandblasted, rhodium steel with counterweight
Power-reserve indicator with baton-style 18K white gold hand, sandblasted and rhodium plated
Baton-style hour-counter hands with counterweight, blue-lacquered brass
Baton-style minute-counter hands with counterweight, red-lacquered brass
Platinum push/pull large knurled crown with Patek Philippe cross engraved
Sapphire crystal display case back
The chronograph incorporates flyback feature (chronograph starts and stops at 2 o’clock, chronograph hand reset, and flyback at 4 o’clock).
This mechanism oscillates at the frequency of 28,800 vph (4 Hz).
The CH 28-520 IRM QA 24H was Patek's first in-house self-winding chronograph movement.
Incomplete (no box, with an extract from the Patek Philippe archives dated 2010)
