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  1. Royal Oak
  • Royal Oak Perpetual Calendar, Watch Reference 26252OR.OO.D092CR.01
  • Royal Oak Perpetual Calendar, Watch Reference 26252OR.OO.D092CR.02
  • Royal Oak Perpetual Calendar, Watch Reference 25820ST.OO.0944ST.03
  • Royal Oak Perpetual Calendar, Watch Reference 25820ST.OO.0944ST.04
  • Royal Oak Perpetual Calendar, Watch Reference 25820ST.OO.0944ST.05
  • Royal Oak Openworked Perpetual Calendar, Watch Reference 25829ST.OO.0944ST.01
  • Royal Oak Openworked Royal Oak Perpetual calendar, Watch Reference 25829PT.OO.0944PT.01
Variations: Model 25820
  • Royal Oak Perpetual Calendar, Watch Reference 25820ST.OO.0944ST.03

    Perpetual Calendar

    Selfwinding perpetual calendar watch indicating the day, date, moon phases, month and leap years. Stainless steel case, silvered dial, stainless steel bracelet.

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      Details

      • Case Width 39.00 mm
      • Case Thickness 9.30 mm
      • Water Resistance 20 m

      Specifications

      Case
      Stainless steel case, sapphire crystal and caseback
      Dial
      Silver-toned dial with “Grande Tapisserie” pattern, white gold applied hour-markers and Royal Oak hands with luminescent coating
      Bracelet
      Stainless steel bracelet with AP folding clasp
      Reference
      25820ST.OO.0944ST.03
      Functions
      Perpetual calendar with day, date, moon phases, months, leap years, hours, minutes
      Movement thickness with module
      4.00 mm
      Total diameter
      12½ mm
      Type of balance
      With Variable inertia blocks
      Frequency of balance wheel
      2,75 (=19'800 alternances/hour) Hz
      Type of balance-spring stud-holder
      Mobile stud
      Balance-spring type
      Flat
      Direction of automatic winding
      Bidirectional
      Type of oscillating weight
      Support and weight segment in 21-carat gold
      Number of jewels
      38
      Power reserve
      40 h
      Number of parts
      343

      specificities

      • Extra-thin movement
      • Suspended barrel
      • Shake of the oscillating weight garanteed thanks to annular ring running on four jewels. Manual finishing of the bridges (polished bevels, satinbrushed edges, Perlage on the recesses)
      • Hand crafted decorative engravings on oscillating weight componants
      • Moonphase made with Physical Vapor Deposited metal onto sapphire
      • Oscillating weight can be custom decorated upon customer's request
      • Perpetual calendar / Date / Day / Month / Leap year / Moonphases

      Calibre

      Calibre 2120 / 2802 Manufacture

      Calibre 2120 / 2802 Manufacture, front
      Front
      Calibre 2120 / 2802 Manufacture, back
      Back
      DOWNLOAD USER MANUAL (PDF) see all watches with the calibre

    Audemars Piguet History

    The perpetual calendar has a memory capable of mastering calendar irregularities through the year 2100.