Audemars Piguet’s official materials identify the integrated selfwinding chronograph calibres covered here as 4401 and 4404—not 4400. If “Calibre 4400” was intended to mean 4401, the key point is that 4401 combines a column wheel, vertical clutch and flyback function in an automatic movement. AP lists it in 43 mm Royal Oak Offshore Selfwinding Chronographs.
What is the Audemars Piguet Calibre 4401?
Calibre 4401 is an integrated, selfwinding chronograph movement. AP describes it as having a vertical clutch and an integrated column wheel, as well as flyback functionality. “Integrated” means the chronograph is designed into the movement architecture rather than presented as a separate add-on module; AP’s cited material does not provide a direct technical comparison with modular chronographs.
AP also identifies an instantaneous date-change mechanism. These are manufacturer descriptions of the movement’s design and functions, not independent test results or claims of superiority over other chronographs. AP explains the movement architecture in its 2022 article, “It Takes Time to Create the Extraordinary”.
What does flyback chronograph mean?
A flyback chronograph can be reset and restarted with a single operation while it is running. The wearer does not first have to stop the chronograph, reset it, and then start it again. It is useful when timing successive intervals, because it reduces the sequence of actions needed between measurements.
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Which Royal Oak Offshore models use Calibre 4401?
AP lists Calibre 4401 in its 43 mm Royal Oak Offshore Selfwinding Chronographs. One reference with published specifications is the Royal Oak Offshore reference 26420IO.OO.A009CA.01, which has a titanium case, grey ceramic bezel and 100 m water-resistance rating.
AP’s current product listing gives the following figures for the reference and its Calibre 4401 movement. These are manufacturer specifications, not independently verified measurements.
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- 1.Tube and screw are of the same thickness and strength as what you have on the watch and are made of the highest quality 316L stainless steel just like original.
- 2.It fit all version of Royal Oak Offshore Chronograph including Safari, Alingi, Polaris, Barrichello, Orchard Road, Arnold , Montoya, Jay-Z, Volcano, Offshore Dual Time, Sincere, Rodeo Drive, Monte Napoleone, Worth Avenue, Tantalum, Royal Oak Offshore Scuba Wempe, Royal Oak Offshore Scuba La Boutique in All Versions.
- 3.size： 28mm and 26.5mm；2 sizes available
- 4.packing: 2pcs tubes and 2pcs screws
- 5.Please confirm the model and size of the item suitable for the watch before purchasing to avoid returns/exchanges. If there is a problem with item you receive, please contact us ， We should be able to resolve the problem.
| Specification | AP listing |
|---|---|
| Case diameter | 43 mm |
| Case thickness | 14.4 mm |
| Water resistance | 100 m |
| Movement jewels | 40 |
| Movement parts | 381 |
| Power reserve | 70 hours |
| Frequency | 4 Hz / 28,800 vibrations per hour |
| Movement diameter | 32 mm |
| Movement thickness | 6.8 mm |
How is Calibre 4401 different from 4404?
AP distinguishes the calibres by the Offshore models in which they appear: its 43 mm Offshore chronographs use 4401, while its 42 mm Offshore chronograph novelties use 4404. AP also describes 4404 in Code 11.59 Selfwinding Chronograph models as an integrated selfwinding chronograph with a column wheel and flyback. The available descriptions establish that the calibres are distinct, but do not provide a like-for-like set of technical specifications for 4404.
AP presents this distinction on its Royal Oak Offshore collection page and describes 4404 in its Code 11.59 model announcement. Do not assume the 4401 figures above also apply to 4404.
Is Calibre 4400 the same as 4401?
The official Audemars Piguet materials cited here name 4401 and 4404; they do not establish that a Calibre 4400 is the same movement as 4401. For the integrated selfwinding chronograph described in those materials, the supported designation is Calibre 4401.
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- Compatible Brand：Audemars Piguet
- Compatible Model：26331IP 26331ST 26331OR
- Movement Cal - ETA 7750
- Hour Hand Size - 9.5mm Minute Hand Size - 14.0mm Sweep Second Hand Size - 14.5mm Sub Dial Hand Sizes - 3.3mm / 4.0mm (X2)
- A set of replacement hands for Audemars Piguet ETA 7750 Cal movement number. These hands are not made by AP / ETA but are designed as after market replacements.
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