SPECIFICATIONS

Brand: Patek Philippe
Model: Annual Calendar 
Reference Number: 5056P
Movement: Automatic
Condition: Very good
Gender: Men’s
Time Period: 2000s
Box: Yes
Papers: Yes

THE CALIBER

Caliber: 315

Jewels: 37

THE CASE

Case Material: Platinum
Case Diameter: 37 mm
Thickness: 11 mm
Waterproof: 100 ft./ 30 m./ 3 ATM
Bezel Material: Fixed convex platinum 
Glass: Sapphire Crystal
Caseback: Open
Dial: Grey
Dial Numerals: Applied 18K white gold Roman numeral hour indices with insets, white minute/second railway track around the outer rim

THE BRACELET / STRAP

Bracelet Material: Black Leather
Buckle: Ardillon
Buckle Material: Platinum

THE FUNCTIONS

Annual calendar, hours, minutes, center sweep seconds hand, sector for 48-hour power reserve indication at 12 o’clock, date window and moon phase aperture at 6 o’clock, a subsidiary dial for the day of the week is at 9 o'clock, and a sub-dial for the month is at 3 o'clock.

FURTHER READING

Round shape case
Luminous filled and 18K yellow gold leaf-shaped hour/minute hands, white stick-shaped center sweep seconds hand
Platinum knurled push/pull Calatrava crown
Sapphire crystal display screw-down case back
Curved, stepped three-body case with concave lugs and a case band set at 6 o'clock with a  Wesselton diamond.
Four correction push-pieces to adjust the calendar indications or the moon phase display: month correction at 2 o'clock, date correction at 4 o'clock, moon phase correction at 8 o'clock, and day of week correction at 10 o'clock 
This caliber 315/299 is rhodium-plated with fausses côtes decoration with Patek Philippe Seal, includes a straight-line lever escapement, and the patented Patek Gyromax balance that is adjusted to compensate for cold, heat, isochronism, and 5 positions.
Shock absorber and a self-compensating free-sprung flat balance spring, and an 18K gold rotor with the Geneva Seal.
The movement oscillates at a frequency of 21,600 vph (3 Hz).
Patek Philippe received a patent for their annual calendar mechanism in 1996
Case, dial, and movement are all signed.
Complete (box and papers)