The AP Royal Oak Offshore Selfwinding Chronograph 43mm is the 26420 family, not the separate 42 mm 26238 family. Audemars Piguet’s published specifications establish its dimensions, materials and movement, but they cannot substantiate a hands-on verdict about comfort, wrist fit or legibility. Here is what the official information does—and does not—tell you about the 43 mm watch.
Which Royal Oak Offshore 43mm is this?
The name covers a family of watches rather than one fixed configuration. The official 43 mm references discussed here belong to AP’s 26420 family. Two examples illustrate how the materials, dial and supplied straps vary.
| Reference | Case and bezel | Dial | Strap(s) listed by AP | Shared specifications |
|---|---|---|---|---|
| 26420IO.OO.A009CA.01 | Titanium case; grey ceramic bezel | Grey Méga Tapisserie, blue counters and external zone, blue inner bezel | Grey rubber strap with titanium pin buckle; an additional blue rubber strap is listed | 43 mm diameter; 14.4 mm thick; 100 m water resistance; Calibre 4401 |
| 26420SO.OO.A002CA.01 | Stainless-steel case; black ceramic bezel | Black Méga Tapisserie | Black interchangeable rubber strap; an additional brown calfskin strap is listed | 43 mm diameter; 14.4 mm thick; 100 m water resistance; Calibre 4401 |
These details are specific to the two references, not a description of every 43 mm model. AP’s collection includes other materials, colors and strap combinations. See the [Royal Oak Offshore collection] and the official pages for the [26420IO.OO.A009CA.01] and [26420SO.OO.A002CA.01].
What the 43 mm dimensions say—and don’t say
For both references above, AP lists a 43 mm case diameter and 14.4 mm thickness. Those figures establish the watch’s nominal size, but they do not establish how it sits on a particular wrist. Case shape, strap adjustment and individual wrist proportions affect fit; no wear observations are available here to turn the dimensions into a comfort or fit verdict.
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AP lists 100 m water resistance for these references. That is the manufacturer’s stated specification, not an independent test result or a substitute for following the watch’s care and operating guidance.
What comes on the titanium reference?
On the 26420IO.OO.A009CA.01, AP specifies a titanium case and grey ceramic bezel, with a glareproofed sapphire crystal and caseback. Its grey dial has a Méga Tapisserie pattern, blue counters and external zone, white-gold applied hour markers, luminous Royal Oak hands and a blue inner bezel. The listed strap is grey rubber with a titanium pin buckle, and AP also lists an additional blue rubber strap and an interchangeable strap system.
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That combination makes the titanium reference a distinct color-and-material choice within the 43 mm family. The stainless-steel 26420SO.OO.A002CA.01 instead pairs a black ceramic bezel and black Méga Tapisserie dial with a black interchangeable rubber strap; AP lists an additional brown calfskin strap for that version.
What does the Calibre 4401 do?
AP specifies its selfwinding Calibre 4401 for the titanium reference, with a flyback chronograph, hours, minutes, small seconds and date. A flyback chronograph can be reset and restarted in one continuous action, rather than stopping, resetting and starting it through separate presses. AP lists 40 jewels, a 70-hour power reserve, a frequency of 4 Hz (28,800 vibrations per hour), 381 parts and a movement thickness of 6.8 mm.
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These are manufacturer-published specifications; they are not independent measurements of timekeeping or reserve. AP also identifies the Calibre 4401 on the stainless-steel reference page.
How does the 43 mm 26420 differ from the 42 mm 26238?
They are separate Royal Oak Offshore Selfwinding Chronograph families: the 43 mm references covered here are in the 26420 family, while 26238 denotes a 42 mm family. Do not apply the 26420 references’ dimensions or variant-specific materials and strap details to a 26238. The material here does not establish a full specification-by-specification comparison between the two families.
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What can—and can’t—be called a hands-on impression?
Audemars Piguet positions the collection as “a sportier and more muscular take on the Royal Oak.” It also calls the 43 mm line “A New Generation in 43 mm” and describes it as combining “hard materials, ergonomic build, latest generation flyback chronograph, interchangeable straps and distinctive looks.” Those are AP’s characterizations, not independent findings; in particular, “ergonomic” is not evidence of measured comfort.
The published specifications support concrete observations about dimensions, construction, dial layout, strap options and movement functions. They do not establish how the watch feels after hours of wear, whether it fits a given wrist, how easily its dial reads in changing light, or how its finishing appears in person. Those judgments require direct inspection or wear, so a genuine hands-on review should not be inferred from the specification sheet.
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