SPECIFICATIONS 

Brand: Audemars Piguet
Model: Royal Oak - Quantieme Perpetual Calendar
Reference Number: 25636PT.OO.0344PT.01
Movement: Automatic
Condition: Excellent
Gender: Men's
Time Period: 1990s
Box: Yes
Papers: Yes

THE CALIBER

Caliber: 2120/2800_SQ
Jewels: 38

THE CASE

Case Material: Platinum 
Case Diameter: 39 mm
Thickness: 9 mm
Waterproof: 65 ft./ 20 m./ 2 ATM
Bezel Material: Fixed platinum secured with 8 screws
Glass: Sapphire Crystal
Caseback: Open back
Dial: Skeleton with white chapter rings for the calendar functions, including the moon phase 
Dial Numerals: No numerals, black painted hour/minute railway track on the outer rim

THE BRACELET / STRAP

Bracelet Material: Platinum 
Buckle: Folding clasp
Buckle Material: 18K white gold

THE FUNCTIONS

Perpetual calendar, moon phase subsidiary dial combined with the lunar calendar at 6 o’clock, month sub-dial at 12 o’clock, date sub-dial at 3 o’clock and day sub-dial at 9 o’clock, hours, minutes, 40-hour power reserve

FURTHER READING

Octagonal case shape
White gold leaf hour/minute hands, blued pencil sub-dial hands
Integrated original bracelet
Sapphire crystal display case-back fixed with 8 screws
Winding rotor with 21K white gold segment, movement is adjustable to heat, cold, isochronism and in 5 positions
Audemars Piguet signature at 6 o'clock
Limited edition of 264 pieces of the Reference n. 25636, of which 34 pieces were made in Platinum, no. 17/34
C series
Complete (box and extract from the Audemars Piguet archives)