SPECIFICATIONS 

Brand: Patek Philippe
Model: Annual Calendar
Reference Number: 5035J-001
Movement: Automatic
Condition: Mint
Gender: Men’s
Time Period: 1996-2003
Box: No
Papers: Open

THE CALIBER

Caliber: 315 S QA 24 H
Jewels: 35

THE CASE

Case Material: 18K yellow gold
Case Diameter: 37 mm
Thickness: 11 mm
Waterproof: 80 ft./ 25 m./ 2.5 ATM
Bezel Material: Fixed 18K yellow gold
Glass: Sapphire Crystal
Caseback: Open
Dial: White ceramic 
Dial Numerals: Raised 18K yellow gold applied and luminous Roman numeral hour indices, railroad minute chapter around the outer rim

THE BRACELET / STRAP

Bracelet Material: Brown Leather
Buckle: Tang
Buckle Material: 18K yellow gold

THE FUNCTIONS

Annual calendar, hours, minutes, seconds, day sub-dial indicator at 10 o’clock, 24-hour (day/night) indicator at 6 o’clock, date aperture at 6 o’clock, month sub-dial indicator at 2 o’clock, 48-hour power reserve 

FURTHER READING 

Round-shaped case
18K yellow gold with luminous insert leaf-shaped hour/minute hands and sub-dials hands, blackened stick shape center sweep seconds hand
Screw-down sapphire crystal display case back 
18K yellow gold pull/push crown with Calatrava cross engraving
Original Patek Philippe strap and tang buckle
This automatic caliber 315 movement is rhodium-plated with fausses côtes decoration and the Seal of Geneva quality mark stamp. It IS constructed with 316 parts and contains a straight-line lever escapement, a shock absorber mechanism, and a 21K gold rotor. The patented Patek Gyromax balance spring that compensates for cold, heat, isochronism, and five positions. 
The mechanism oscillates at 21,600 vph (3Hz) and has a self-compensating free-sprung flat balance spring.
Three correction push-pieces to adjust the calendar indications:
Month correction at 2 o'clock, date correction at 4 o'clock, and day of week correction at 10 o'clock
The dial, case, and movement are all signed.
This Annual Calendar mechanism distinguishes between months of 30 and 31 days; the ingenious mechanism is entirely rotary, without the uneven movements of cams and springs in the conventional perpetual calendar.
Patek Philippe produced this model from 1996 to 2005 and was named "Watch of the Year" in 1996.
Incomplete (no box, with Patek Philippe certificate of authenticity - open papers)