OCTA Factory Audemars Piguet Royal Oak Offshore Chronograph 26238TI.OO.A056CA.01 42mm Steel Green Rubber Strap Arabic Numerals Green Dial

OCTA Factory Audemars Piguet Royal Oak Offshore Chronograph 26238

The OCTA Factory Audemars Piguet Royal Oak Offshore Chronograph 26238 is a 42mm automatic flyback chronograph featuring a Cal.4404-style integrated movement, a free-sprung balance with inertia adjustment weights, and a supplied power reserve of approximately 70 hours.

The design combines the Royal Oak Offshore’s octagonal bezel, three-dimensional Méga Tapisserie dial, and contrasting brushed and polished surfaces with a functional chronograph mechanism.

Its movement incorporates central chronograph seconds, a 30-minute counter, a 12-hour counter, a date display, and a flyback function.

42mm Royal Oak Offshore Case

The Royal Oak Offshore 26238 uses a 42mm case, retaining the angular geometry associated with the collection.

The exterior features an octagonal bezel with exposed screws, defined case edges, and alternating brushed and polished surfaces.

The 26238 series includes configurations using stainless steel, ceramic, titanium, and precious-metal materials. The actual material depends on the selected reference and version.

The supplied configuration also incorporates a screw-down crown and chronograph pushers.

Octagonal Bezel and Exterior Finishing

The octagonal bezel is one of the most recognizable elements of the Royal Oak Offshore design.

Its flat surfaces, angular transitions, and exposed screw arrangement create a distinct geometric appearance.

OCTA uses contrasting finishing techniques across the case and bracelet components, including satin brushing and polishing.

These different surface treatments emphasize the edges and transitions of the case without relying on additional decorative elements.

Méga Tapisserie Dial

The dial features the Méga Tapisserie three-dimensional grid pattern.

This textured surface uses a raised geometric structure that produces different reflections depending on lighting and viewing angle.

The supplied dial-production process includes CNC machining, electroplating, and sandblasting.

Available dial colors within the described range include:

* Blue
* Green
* Grey

The dial also incorporates luminous hands and hour markers for visibility in reduced lighting.

Cal.4404-Style Integrated Automatic Movement

The OCTA 26238 uses a Cal.4404-style integrated automatic chronograph movement.

Its movement architecture combines automatic winding, conventional timekeeping, chronograph functions, and flyback operation.

The movement is described as an integrated chronograph construction rather than a basic automatic movement fitted with a separate decorative chronograph display.

The Cal.4404 designation describes the movement configuration and should not be interpreted as a genuine Audemars Piguet manufacture calibre.

Free-Sprung Balance with Inertia Weights

A distinguishing mechanical feature of the OCTA version is its free-sprung balance architecture with inertia adjustment weights.

Unlike a conventional regulated balance, a free-sprung system does not use a traditional regulator index to adjust the effective hairspring length.

Instead, rate adjustment is performed by changing the balance’s effective inertia.

This is a structural characteristic of the movement, rather than simply a decorative feature.

Free-sprung construction alone does not guarantee superior accuracy; movement performance also depends on assembly, regulation, lubrication, and component condition.

Functional Flyback Chronograph

The OCTA movement incorporates a flyback chronograph function.

A flyback chronograph allows an active timing measurement to be reset and immediately restarted through the flyback control, without first completing the conventional stop-and-reset sequence.

This distinguishes flyback operation from a standard chronograph.

The supplied chronograph configuration includes:

* Central chronograph seconds
* 30-minute chronograph counter
* 12-hour chronograph counter
* Flyback reset-and-restart function

The chronograph is therefore intended as a working mechanical complication rather than a decorative subdial arrangement.

Date Display

The movement also includes a date indication, integrated into the dial alongside the chronograph displays.

The date mechanism operates separately from the elapsed-time measurements.

Calendar adjustment should be performed using the appropriate crown position and operating sequence.

28,800 BPH Movement Frequency

The supplied movement frequency is:

28,800 vibrations per hour (4 Hz)

This corresponds to eight balance vibrations per second.

Beat frequency is one of the basic specifications used to describe the operating architecture of a mechanical movement.

It should not, by itself, be treated as a measurement of timekeeping accuracy.

Approximately 70-Hour Power Reserve

OCTA specifies approximately 70 hours of power reserve.

This is the nominal running duration available from a fully wound movement.

Actual running time may vary depending on winding condition, chronograph usage, movement adjustment, and the condition of the individual watch.

Movement Bridge Decoration

The movement incorporates decorative finishing inspired by traditional mechanical watchmaking.

The supplied finishing details include Geneva-style striping and beveled bridge edges.

These decorative features can be examined through close-up movement photography, particularly around the bridges and chronograph components.

The movement is also described as incorporating more than 400 individual components, reflecting the complexity of its chronograph architecture.

Sapphire Crystal

The watch uses a sapphire crystal with an anti-reflective treatment.

The crystal protects the dial while allowing the applied markers, Méga Tapisserie texture, and chronograph indications to remain visible.

The appearance of reflections will vary depending on lighting and viewing angle.

Strap and Bracelet Configurations

The 26238 series includes configurations with rubber straps and metal bracelets.

Rubber provides a flexible strap option, while the metal bracelet continues the angular design language of the case.

For metal-bracelet configurations, the alternating brushed and polished surfaces provide visual continuity between the case and bracelet.

Water-Resistance Specification

The supplied series specification lists 100 meters of water resistance.

This should be treated as a nominal model specification, not proof that every individual OCTA watch has passed a 100-meter pressure test.

Professional pressure testing is recommended before intentional water exposure.

Technical Specifications

Specification Details
Factory OCTA Factory
Brand Audemars Piguet
Collection Royal Oak Offshore
Series 26238
Case Diameter 42mm
Case Materials Vary by configuration
Movement Cal.4404-Style Integrated Chronograph
Winding Automatic
Balance Architecture Free-Sprung
Regulation Inertia Adjustment Weights
Chronograph Functional Flyback
Chronograph Counters 30-Minute / 12-Hour
Central Chronograph Seconds Yes
Date Display Yes
Frequency 28,800 BPH / 4 Hz
Power Reserve Approx. 70 Hours
Dial Méga Tapisserie
Dial Colors Blue / Green / Grey
Crystal Anti-Reflective Sapphire
Luminous Display Hands and Hour Markers
Crown Screw-Down
Strap Options Rubber / Metal Bracelet
Water Resistance 100m Nominal Series Specification

Integrated Flyback Movement vs. Standard Chronograph

The most significant mechanical distinction of this OCTA configuration is the combination of an integrated chronograph, flyback mechanism, and free-sprung regulating architecture.

A conventional chronograph generally requires the wearer to stop the timing measurement before resetting it.

A flyback chronograph instead permits the active timing cycle to be reset and restarted directly.

The free-sprung balance is a separate mechanical feature, relating to the regulation of the movement rather than the operation of the chronograph.

These two functions should therefore be understood independently.

Case, Dial and Movement Architecture

The 26238 combines three distinctive design and mechanical elements.

The 42mm angular case establishes the watch’s exterior proportions.

The Méga Tapisserie dial adds three-dimensional texture and accommodates the chronograph indications.

The Cal.4404-style movement supplies the mechanical chronograph and flyback functions.

Together, these features distinguish this configuration from simpler three-hand Royal Oak Offshore models.

Wearing and Care

The 42mm case and angular exterior create a substantial wrist presence.

When operating the chronograph, use the pushers gently and avoid applying unnecessary force.

The flyback function should only be used according to the movement’s intended operating sequence.

Avoid strong impacts, powerful magnetic fields, and unauthorized movement adjustments. The free-sprung balance should be serviced by a watchmaker familiar with inertia-regulated systems.

Although the series carries a nominal 100m water-resistance specification, the individual watch should be pressure-tested before intentional water exposure.

Frequently Asked Questions

What size is the OCTA Royal Oak Offshore 26238?
The watch has a 42mm case diameter.

What movement does the OCTA 26238 use?
It uses a Cal.4404-style integrated automatic chronograph movement with a free-sprung balance architecture.

Does the OCTA 26238 have a functional flyback chronograph?
Yes. The supplied movement configuration includes a functional flyback mechanism that allows the running chronograph to reset and immediately restart.

What chronograph counters are included?
The watch incorporates central chronograph seconds, a 30-minute counter, and a 12-hour counter.

What does free-sprung mean?
A free-sprung balance uses inertia adjustment rather than a conventional regulator index to regulate the movement’s rate.

Is a free-sprung movement automatically more accurate?
No. Accuracy depends on the complete movement’s construction, regulation, assembly, and condition.

What is the movement frequency?
The supplied frequency is 28,800 BPH, equivalent to 4 Hz.

How long is the power reserve?
The movement has a supplied power-reserve specification of approximately 70 hours.

What is the Méga Tapisserie dial?
Méga Tapisserie is a three-dimensional geometric dial pattern with raised sections that create texture and changing light reflections.

Does the watch have a date display?
Yes. The movement includes a date function alongside the chronograph indications.

What case materials are available?
The described 26238 series includes stainless steel, ceramic, titanium, and precious-metal configurations. Material selection depends on the specific version.

Is the watch suitable for swimming?
The supplied series specification is 100m water resistance, but the individual watch should undergo professional pressure testing before swimming or other intentional water exposure.

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