The 38mm Royal Oak Selfwinding Chronograph has always occupied a special position within Audemars Piguet’s catalogue: compact, versatile, and appealing to both men and women seeking a more restrained Royal Oak chronograph. Now, the model takes a decisive mechanical step forward with the introduction of the brand-new in-house calibre 6401. Replacing the long-standing outsourced movement, this integrated chronograph brings a higher 4Hz frequency, improved architecture, and a longer power reserve, aligning the 38mm Royal Oak Chronograph more closely with the manufacture’s modern technical standards while preserving its iconic design language.The Royal Oak Chronograph 38mm retains its faithful proportions, measuring 38mm in diameter and now 11.1mm in thickness, which is a marginal increase over its predecessor due to the new movement. Offered in stainless-steel or 18k pink gold, including one pink gold version with a diamond-set bezel.
The case maintains the unmistakable Royal Oak architecture: a tonneau-shaped mid-case topped by a raised octagonal bezel secured with eight exposed screws. Satin-brushed surfaces contrast with polished bevels, highlighting the interplay of light that defines Gérald Genta’s 1972 design.
For the first time in this 38mm chronograph line, a sapphire crystal caseback replaces the former solid back, revealing the new calibre 6401. The exhibition window offers a view of the 348-component movement, its bridges decorated with Côtes de Genève, circular graining, and polished bevels. The openworked rotor further enhances visibility, reinforcing the shift toward greater mechanical transparency.
A screw-locked crown sits at 3 o’clock, flanked by polished chronograph pushers housed within brushed hexagonal guards. The glareproofed sapphire crystal protects the dial, maintaining clarity while preserving the angular case geometry. Water-resistance can reach up to 50 meters (164 feet).
The dial retains the classic Grande Tapisserie pattern, offered in three executions: a blue version for the stainless-steel model,
a dark grey with silver-toned counters for one pink gold reference,
and a sand gold-toned version with beige counters paired with a diamond-set bezel. The signature guilloché texture creates depth beneath the applied baton indices and recessed chronograph sub-dials, preserving the unmistakable Royal Oak visual identity.
Subtle but meaningful layout revisions accompany the new movement. The 30-minute counter now sits at 9 o’clock, while the 12-hour counter has been repositioned to 3 o’clock, reversing the previous configuration.
The date window has also been carefully adjusted to sit precisely between the 4 and 5 o’clock markers, improving symmetry across the dial. The small seconds at 6 o’clock now features Arabic numerals at 20, 40, and 60, refining legibility and visual balance.
The layered construction of the Tapisserie dial enhances depth between the patterned base and the snailed counters. Applied gold baton indices and matching hands reinforce the watch’s refined sport-luxury character. Luminescent coating on the hands and hour markers ensures clear visibility in low-light conditions while preserving the dial’s elegant aesthetic.
Audemars Piguet Royal Oak Selfwinding Chronograph 38mm
The “Audemars Piguet Royal Oak Selfwinding Chronograph 38mm” (References below) is powered by the in-house self-winding mechanical movement, caliber 6401 with 44 jewels, 348 components, and 28,800 vph. It comes equipped with an integrated column-wheel chronograph and vertical clutch system. Power reserve can last up to 55 hours, when fully wound.
Mounted on this watch is an integrated stainless-steel or 18k pink gold bracelet secured by a triple-folding clasp.
The bracelet’s alternating brushed and polished surfaces echo the case finishing, reinforcing the Royal Oak’s cohesive design language.
On the wrist, the 38mm case offers balanced proportions and versatile wearability, while the slightly increased thickness remains discreet, maintaining the chronograph’s elegant yet assertive presence.
(Ref#: 26450ST.OO.1356ST.01) - Stainless-Steel with Blue Dial
MSRP: $43,000.00 USD
(Ref#: 26450OR.OO.1356OR.01) - 18k Pink Gold with Grey Dial
MSRP: $84,500.00 USD
(Ref#: 26450OR.ZZ.1356OR.01) - 18k Pink Gold with Diamond Bezel
MSRP: $91,600.00 USD
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