Name: Audemars Piguet Royal Oak Offshore Diver 15720ST.OO.A010CA.01
Brand: Audemars Piguet
SKU: 15720ST.OO.A010CA.01

The 15720 is Audemars Piguet's current Royal Oak Offshore Diver, a 42mm steel sports watch built for serious water use with 300m water resistance and a crown-operated inner rotating bezel. It replaced the 15710 in 2020 with a revised lug geometry, updated bracelet, and a sharper overall silhouette. Collectors regard it as the most purposeful Offshore in the lineup -- a tool watch with genuine diver credentials that doesn't pretend to be something else.

What it is

AP introduced the 15720 in 2020 as a direct replacement for the 15710ST, refreshing the lug shape and bracelet construction while keeping the core diver proposition intact. The watch runs the in-house Calibre 3120, a 40-jewel automatic with a 60-hour power reserve, first introduced in 2003 and well proven across the broader Royal Oak Offshore family. The 15720ST.OO.A010CA.01 is the steel-on-rubber reference with blue accents; AP has also released versions on bracelet and in different dial colors.

No significant movement changes have accompanied the 15720 generation -- the redesign was cosmetic and ergonomic rather than mechanical. Production is ongoing as of 2026.

Buying notes

Confirm the reference suffix carefully: the A010CA.01 denotes the blue rubber strap configuration, and dial color designations shift across the suffix codes. Inspect the crown and crown tube closely -- the inner bezel mechanism adds a failure point that pure dial-side divers avoid, and crown tube damage is expensive to repair on any Offshore. Check the caseback gasket condition and ask for any service records; examples used in water are more likely to have unseen corrosion inside the bracelet links and around the crown tube.

The 2020 lug redesign means 15710 parts are not interchangeable with 15720 cases, so verify that any replaced parts are generation-correct. Bracelet stretch is common on worn examples -- check for excessive play at the clasp and between center links before buying pre-owned.

Market read

The 15720 trades at or slightly above retail in the secondary market as of early 2026, with clean unpolished examples carrying a modest premium over worn or polished pieces. Unlike the Royal Oak 15500, the Offshore Diver has not attracted the same speculative heat, which keeps prices more rational. Blue dial references on rubber attract the most collector interest; bracelet versions trade at a similar level.

Expect to pay $25,000-$32,000 USD for a pre-owned example in very good condition, with full-set retail-purchase examples at the higher end of that range.

Service expectations

The 15720 runs Calibre 3120, which AP recommends servicing every 5-7 years under normal use. Full service at an AP service center typically runs $2,000-$3,500 USD depending on parts required and regional pricing. Given the 300m water resistance rating, any service should include pressure testing and gasket replacement -- do not skip this step on a diver.

Editorial copy is AI-drafted from primary sources and reviewed by Grail Atlas before publication. Where the text is uncertain about a fact, it says so. Email corrections@grailatlas.com if something reads wrong. Signals on this page (community, OSINT) are clearly separated from the editorial sections.

Common#2 in familyOfficial press photos

Condition affects price

Pre-owned watches trade across a wide condition spectrum. These ranges are typical for the secondary market.

New Old Stock

Unworn example retaining original packaging, tags, and warranty documentation.

+30–50% vs median

Unpolished

Worn but the case has never been polished; original brushed and polished surfaces are intact.

+15–25% vs median

Polished

Case has been professionally or amateur polished at some point; edge definition is softened.

-15 to -5% vs median

Recently Serviced

Movement has been recently serviced with documented service records; case condition varies.

At median

Project

Needs service, has dial or hand issues, non-original parts, or other remediation before daily wear.

-50 to -25% vs median

Full condition grading guide →

Market price

$16,000–$24,000

steel·2026 Q2

Price trend chart coming soon

The updated Royal Oak Offshore Diver 15720 with its ratchet-wheel crown protection trades in a tighter band than the prior generation; secondary prices are stable and limited-edition dial configurations carry premiums.

Editorial estimate, 2026 Q2. Actual prices vary by condition, date, and box/papers status.

In-house manufacture caliber · caliber AP Caliber 3120 (automatic, 60-hour power reserve) · 60h power reserve (2.5 days)

Medium-large: suits wrists 6.5 in+ (16.5 cm+)

42 mm case. Wears confidently on average to larger wrists. May overhang on slender builds.

Not yet rated

Community + OSINT signals haven’t landed for this reference yet. We don’t publish a rating against zero signal: the number would mean nothing. Editorial body + caliber + market value still surface above; ratings appear once the signal corpus does.

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Authentication

The inner rotating bezel is operated by the crown only; any external bezel grip indicates a non-genuine or modified case.

Known issues in the market

External bezel modifications added post-sale to cosmetically differentiate from the standard Royal Oak.
Inner bezel mechanism wear causing slippage or inability to hold position.

Area	What to check	What is correct	Red flag
crown	Inner bezel operation via crown	Rotating inner bezel engages and holds position when operated by crown; no external grip surface on the bezel	External grip surface indicating a non-genuine or modified external bezel; inner bezel slipping or not holding set position
dial	Mega Tapisserie pattern	Offshore Diver Mega Tapisserie consistent with 15720 color specification; correct lume application on indices and hands	Standard Royal Oak Tapisserie scale; dial color inconsistent with 15720 specification
case	Rubber-clad crown surround	Rubber crown surround intact; crown engages inner bezel and winding/setting functions correctly	Deteriorated rubber surround; crown not engaging inner bezel mechanism

Common legitimate replacements

Inner bezel mechanism is AP-specific; repair requires AP-authorized service.
Rubber crown surround replacement is a routine service item; confirm it was replaced with original AP specification rubber.

Expert resources: AP Royal Oak Offshore Diver documentation at audemarspiguet.com. WatchUSeek AP forum for 15720 inner bezel mechanism assessment.

Authentication guide

Last reviewed June 2026

The Royal Oak Offshore Diver 15720 has no chronograph pushers -- it is a pure three-hand diver with a rotating bezel. The absence of pushers is the immediate visual differentiator from the Offshore chronograph line, and fakes sometimes misrepresent one as the other.

Known reproduction risks

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MEDIUM

Fakes exist but at lower quality than the Offshore chronograph market -- the 15720 is a newer and less-established fake target.

Presence of pushers on the case -- the Diver 15720 has no chronograph pushers at all; any case with side pushers is a different model or a fake presenting as the Diver
Rotating bezel that spins freely in both directions -- a genuine unidirectional bezel does not rotate counterclockwise
Rubber bracelet that attaches with a visible pin or spring bar rather than the integrated lug architecture
Crown at 3 o'clock instead of 9 o'clock

LOW

Non-Diver Offshore Chronograph (15710ST) sold as the Diver 15720 to misrepresent a more common reference as the Diver.

Chronograph pushers at 2 and 4 o'clock on a stated Diver -- these are definitionally absent on the 15720
Sub-dials on the dial face (the Diver has no sub-dials)
Reference number on the case midband that begins 15710 rather than 15720

Dial variants by era

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Era	Description	Identifiers
2021 to present (steel/blue, primary production)	The blue dial with integrated rubber bracelet is the defining configuration of the Diver 15720 launch.	"Mega Tapisserie" blue dial -- same texture class as the Offshore chronograph but with no sub-dials and no date Three hands only: hours, minutes, central seconds. No chronograph architecture anywhere on the dial Unidirectional rotating bezel with a notched rubber insert at the 12 o'clock zero position Integrated rubber bracelet that is flush with the case at the lug junction -- this is a one-piece rubber architecture, not an attached strap Screw-down crown at 9 o'clock for diving spec -- no pusher guards because there are no pushers
2021 to present (steel/black, secondary colorway)	Black dial variant ships alongside the blue. Same case and bezel architecture, different dial tone.	Black "Mega Tapisserie" dial -- the raised squares are visible under raking light despite the dark color Black rubber bezel insert matching the dial tone Same integrated rubber bracelet architecture as the blue variant Cal. 4308 visible through the exhibition caseback (same movement across blue and black dial variants)

Service part flags

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Rotating bezel

Original: Unidirectional rotating bezel with a notched rubber insert. Rotation engages with a positive, audible click at each increment. The zero marker at 12 o'clock aligns precisely with the 12 o'clock position when the bezel is at its indexed zero.

Replacement tells

Bezel rotation that does not produce a positive click -- worn detent spring or incorrect replacement bezel assembly
Zero marker that does not align correctly with the 12 o'clock position at the zero index
Rubber insert that shows lateral wobble or play -- correctly seated bezel inserts are stable without movement
Rubber insert color that does not match the dial colorway (blue insert for blue dial, black for black dial)

Integrated rubber bracelet

Original: The rubber bracelet is part of the case architecture, not a separate strap. The junction between rubber and case at the lug is flush and sealed. The deployment clasp is AP-branded.

Replacement tells

Gap or raised edge at the lug junction indicating a separately attached strap rather than the integrated system
AP clasp without the correct "AP" engraving or with aftermarket substitute hardware
Rubber hardness that differs from production standard -- very soft or very stiff rubber can indicate aftermarket replacement
Bracelet taper that does not match the case width progression for this reference

Crown

Original: Screw-down crown at 9 o'clock position. Screw-down is a diving specification requirement for the 15720. Crown engages with clear resistance in the threaded down position.

Replacement tells

Crown that pushes in but does not screw -- a push-pull crown on this reference is incorrect for the diving specification
Crown position at 3 o'clock (incorrect -- should be 9 o'clock, matching the Royal Oak Offshore diver layout)
Crown that does not achieve a positive screw engagement with the case tube

Caseback

Original: Sapphire display caseback showing Cal. 4308 with AP-engraved rotor. The word "DIVER" appears in the case engravings. Reference number and serial are on the case midband.

Replacement tells

"DIVER" designation absent from the case engravings on a stated 15720
Caseback showing a movement with chronograph architecture (bridges and column wheel layout inconsistent with a three-hand movement)
Rotor finish that is uniformly finished rather than the alternating brushed/polished AP standard

Case back markings

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2021 to present (15720ST stainless steel)

Sapphire display caseback with Cal. 4308 visible
"DIVER" designation in the engraved text on the case body
Reference number (15720ST.OO.A027CA.01 or variant) on the case midband
Serial number on the case midband
AP-engraved rotor visible through the caseback with alternating finishing sectors
"300M / 1000 FT" water resistance rating in the caseback engravings

Movement tells

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Cal. 4308 is the Diver-specific movement and is distinct from the Cal. 3120 used in the Offshore chronograph. The 4308 is a three-hand automatic with no chronograph mechanism -- no column wheel, no coupling lever, no reset hammer.
The 4308 runs at 28,800bph (8 beats per second). The seconds hand advances in 8 micro-steps per second. The older Cal. 3120 in the chronograph runs at 21,600bph, so an inconsistent beat rate is a cross-reference signal.
The movement should show no sub-dial cutouts through the caseback -- the dial architecture is three-hand only and the movement bridges correspond.
AP service records for the 15720 use Cal. 4308 documentation. Any service paperwork referencing a different caliber means the watch has been non-standard serviced.
Depth rating of 300m requires verified crown seal integrity. A properly sealed 15720 will pass a pressure test at a certified service center.

Sources: WatchUSeek -- AP Royal Oak Offshore Diver identification threads; Audemars Piguet boutique serial verification service; AP product specification sheets for ref. 15720ST.