Royal Oak Offshore 37 mm Gets Calibre 6401 and Summer Colours

Key Highlights

• Three new 37 mm Royal Oak Offshore Selfwinding Chronograph references introduced for summer 2026
• All powered by the new in-house Calibre 6401, replacing the Calibre 2385 that served the Manufacture since 1997
• Titanium used in the 37 mm Offshore line for the first time across two of the three references
• Two models feature diamond-set bezels (32 brilliant-cut diamonds, approximately 1 carat each)
• Colour palette spans turquoise, pink and light blue, each matched to interchangeable rubber straps
• Sapphire caseback now reveals Calibre 6401 and its rhodium-toned 22-carat pink gold oscillating weight
• Date display repositioned from 4:30 to 6 o’clock; redesigned Tapisserie dial with larger squares and new bathtub hands

Distinctive Traits

Audemars Piguet has long understood that the Royal Oak Offshore occupies its own register within the collection: louder, more physical, built for the kind of confidence that does not ask for permission. The 37 mm format has always been the Offshore’s way of extending that energy to a broader audience without compromising the original proposition. These three new references sharpen that logic considerably.

The case has been made slightly thinner than its predecessor, and the bezel now curves from 6 to 12 o’clock. On the flanks, redesigned push-piece guards with polished angles flow into the case middle with greater continuity. The Tapisserie dial has been reworked with larger squares, and new bathtub hands replace the previous generation’s form. Luminescent hour-markers on the inner bezel create a calibrated contrast against the enlarged Arabic numerals, while the date has migrated from 4:30 to a cleaner position at 6 o’clock. Each watch ships with an interchangeable rubber strap, its underside moulded with the AP monogram.

Design & Materials

The turquoise titanium reference (26430TI.OO.A358CA.01) is the most direct expression of the trio’s summer brief. Titanium appears in the 37 mm Offshore for the first time, and the colour — extending from the dial and inner bezel counters to the rubber strap — reads as an unambiguous statement of seaside intent. Rhodium-toned numerals and 18-carat white gold hands filled with white luminescent material complete the three-toned composition.

The second reference (26430IS.ZZ.A514CA.01) pairs titanium with a stainless steel bezel set with 32 brilliant-cut diamonds totalling approximately 1 carat. A bright pink Tapisserie dial and matching strap provide the contrast, while white hands and numerals maintain legibility. The third model (26430OR.ZZ.A352CA.01) switches to 18-carat pink gold throughout — case, crown, push-pieces, caseback frame and pin buckle — with a matching diamond-set bezel. A light blue Tapisserie dial and inner bezel carry 18-carat pink gold numerals and hands filled with blue luminescent material, with pink gold thread encircling the tone-of-tone counters.

Movement & Mechanics

Calibre 6401 was developed entirely in-house over five years. It made its debut at Watches and Wonders earlier in 2026 within the Royal Oak Chronograph, and now extends to the 37 mm Offshore line, ensuring technical coherence across the brand’s chronograph portfolio.

The movement is a selfwinding integrated column wheel chronograph with Audemars Piguet’s patented vertical clutch system governing the synchronisation of the clutch levers. Its architecture has been simplified to reduce component count and eliminate unnecessary play, resulting in push-pieces that require less pressure to engage. At 5.7 mm thick across a 27 mm diameter, it delivers a 55-hour power reserve at a frequency of 4 Hz (28,800 vibrations per hour) with 350 parts and 44 jewels. The sapphire caseback — a new feature for the Offshore references housing this calibre — displays the movement’s Côtes de Genève finishing, alternating satin-brushed and polished surfaces, and the dark grey NAC-coated 22-carat pink gold oscillating weight.

Heritage & Lineage

Designed by Emmanuel Gueit and launched in 1993, the Royal Oak Offshore was a deliberate provocation — oversized proportions, exposed rubber gaskets, and a virility that earned it the nickname “The Beast”. The creative logic of the 1980s and the kinetic world of high-performance yacht racing shaped its character from the outset.

More than thirty years on, Audemars Piguet is directing that same energy through a contemporary lens. These 37 mm references do not soften the Offshore’s spirit; they redirect it — through lighter materials, finer detailing, and a colour sensibility that belongs firmly to this moment. All three are water resistant to 50 metres, confirming that the sport mandate has not been set aside in favour of aesthetics.

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