Audemars Piguet Calibre 2120

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Summary

General View

Basic Movement Calibre 2120

Details of the basic movement for the Audemars Piguet Calibre 2120.

Perpetual Calendar Mechanism

Explanation of the perpetual calendar mechanism integrated into the watch.

Description of Watch

General Comments

Overview of the Audemars Piguet Perpetual Calendar as an exceptional timekeeper.

Technical Details of Movement

Specifications including thickness, casing diameter, vibrations, and power reserve.

Indications Provided by the Watch

Lists the indications shown on the watch: hours, minutes, date, day, month, and moon phases.

Functions and Indications Diagram

Identifies watch functions and indicators using the provided diagram and crown positions.

Basic Functions

Setting Watch Hands

Instructions on how to set the watch hands using the crown in position B.

Hour Difference (Time ZONE)

Explanation of how to adjust the hour difference for time zones without damaging the mechanism.

Winding Up the Watch

How to restart the watch using the crown in position A and ensure it rewinds.

Correcting the Indications

Corrections for Short Stops

Procedure for correcting indications after a stop of up to 3 days using the crown.

Preliminary Precautions for Correction

Steps to take before using correctors for prolonged stops to avoid damage.

Correction Procedure for Prolonged Stops

Detailed steps for correcting date, day, month, and moon phases after a prolonged stop.

Some Notes on Physical Time

Phases of the Moon

Information on the duration of a lunation and its representation on the watch dial.

Leap Year

Definition and examples of leap years relevant to the watch's calendar function.

Accessories

Rotating Presentation Case

Description of the automatic winding box for constant rewinding of the watch.

Correction Tool

Recommendation to use the provided device for operating the correctors.

This document describes the Audemars Piguet Perpetual Calendar watch, an exceptional timekeeper with a sophisticated mechanism.

Function Description

The Audemars Piguet Perpetual Calendar watch is an automatic timepiece that displays hours, minutes, date, day, month, and phases of the moon. Its Perpetual Calendar mechanism is mechanically programmed to automatically account for leap years, ensuring accurate date display without manual adjustment for these occurrences. The watch is designed to rewind automatically through the normal movement of the watch on the wrist.

Important Technical Specifications

Basic Movement: Calibre 2120
Thickness of Basic Movement (including rotor): 2.45 mm
Thickness of Movement and Assembled Perpetual Calendar Mechanism: 4.00 mm
Casing-Diameter: 28.00 mm (12¹/2 ligne)
Vibrations/Hour: 19,800 (2.75 Hz)
Jewelling: 38 rubies
Power Reserve: In excess of 40 hours when fully wound
Winding: Automatic winding in both directions
Rotor: Made of 21 carat gold, turns on four ruby runners
Anti-shock System: "KIF Elastor" on balance
Balance: Mobile stud, variable inertia balance (Free sprung)
Lunation Duration: A lunation (moon cycle) lasts for 29 days, 12 hours, 44 minutes, 2.8 seconds.

Usage Features

The watch features a two-position crown for various adjustments:

Position A: Winding button for manually winding the movement.
Position B: Winding button for hand-setting.

Basic Functions:

Hand-setting: To set the watch hands, pull out the crown to position B. This allows for easy correction of several minutes or hours. It is important to distinguish between 12 o'clock midday and 12 o'clock midnight during this process.
Hour Difference (Time Zone): The hour difference can be corrected between 1 a.m. and 6 p.m. without damaging the mechanism. If hands are turned back beyond midnight, the date and day will appear one day ahead briefly, but this does not require correction.
Winding Up: If the watch stops, a few turns of the crown in position A will restart it. Subsequent movement of the watch on the wrist will ensure it rewinds automatically.

Correcting the Indications (Date, Day, Month, Moon Phases):

Corrections for a Stop of 3 Days Maximum: Use the winding button (position B) to turn the hands clockwise until the correct indication is reached.
Corrections for a Prolonged Stop (in excess of 3 days), using Correctors:
- Preliminary Precautions: Before using the correctors, turn the hands (crown in position B) clockwise until the date indicator jumps 1 day. Continue turning clockwise to move both hands to 12 o'clock (midday). In this position, no part of the mechanism is working, allowing correctors to be activated without damaging the calendar.
- Correction Procedure (using a correction tool):
  1. Date (and Month): Correct the date (simultaneously with the day) and, at the end of the month, the month, using the corrector located at the 10 o'clock position (1).
  2. Day: Correct the day using the corrector located at the 8 o'clock position (2).
  3. Phases of the Moon: Correct the moon phases using the corrector located at the 4 o'clock position (3).
Adjusting Moon Phases: Position the moon indicator to the 15th day as shown in the indication diagram (9). To establish the date of the last full moon, press the corrector once for each day between the date of the last full moon and the current date. 4. Resetting the Time: For the first half of the day (before midday), turn the hands anti-clockwise. For the second half of the day (after midday), turn the hands clockwise.

Leap Year: The watch automatically accounts for leap years, which occur every year divisible by 4 (e.g., 1916, 1920, 2000, 2004, 2008).

Maintenance Features

Correction Tool: A specific correction tool is provided and recommended for use when working on the correctors to prevent damage.
Rotating Presentation Case: To ensure the Perpetual Calendar rewinds constantly, the watch is supplied with an automatic winding box. This box is powered by two lithium batteries and keeps the watch in constant motion, maintaining its accuracy and power reserve.

The watch's indications will remain precise from the start of the following day unless another reset is performed.