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Repair common Windows errors and clear accumulated junk for a smoother, more stable PC - no reinstall needed.Free scan · no reinstallThis review focuses on the blue-dial stainless-steel Audemars Piguet Royal Oak Chronograph reference 26240ST.OO.1320ST.05, rather than treating every 41 mm version as identical. AP lists a 41 mm case, 12.4 mm thickness, 50 m water resistance and selfwinding calibre 4401 with a flyback chronograph and 70-hour power reserve. Its US product page showed a $44,400 list price when retrieved on October 7, 2026; that is not a resale valuation.
Which 41 mm Royal Oak Chronograph is this?
The Royal Oak Chronograph is a family, not one fixed dial-and-price configuration. The example reviewed here is AP’s stainless-steel reference 26240ST.OO.1320ST.05, with a “Bleu nuit nuage 50” dial and “Grande Tapisserie” pattern. Those names and specifications come from the official US product listing.
AP’s retrieved results also include steel 26240ST versions with khaki and silver-toned dials. Check the complete reference suffix when comparing listings: the family name and 41 mm size alone do not establish that the dial, listed price or other configuration details match.
Case, dial and published specifications
AP specifies a 41 mm stainless-steel case measuring 12.4 mm thick, with 50 m water resistance. The listing describes a glareproofed sapphire crystal and caseback, a screw-locked crown, white-gold applied hour markers, luminescent Royal Oak hands, and a steel bracelet with AP folding clasp.
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- Fit For Audemars Piguet Royal Oak 41mm Watch Case
- Fit for Model Number: 15400OR.OO.D002CR.01 , 15400ST.OO.1220ST.03 , 15400ST.OO.1220ST.01 , 26320OR.OO.D002CR.01 , 15400OR.OO.1220OR.01...
- Sise: 10.5mmx1.5mmx1.0mm M:1.4mm
- Package Include: 4 pieces
- We sell only the best quality replacement watch parts and accessories for the watch. We have been selling online for over 10 years. If you have any questions, please contact us in time.100% Satisfaction Guarantee!
These are manufacturer specifications, not independent measurements or evidence of how the watch fits a particular wrist. The available evidence does not establish firsthand wear, bracelet feel, finishing, accuracy or legibility. Nor should the stated 50 m rating be treated as an independent recommendation for swimming or other water activities.
What calibre 4401 offers
Calibre 4401 is a selfwinding chronograph movement. AP lists a flyback chronograph, hours, minutes, small seconds and date. Its published technical figures are:
Rank #2
- Material: Stainless Steel
- LACAK Hexagon Watch Pusher Screwdriver compatible with Audemars Piguet Royal Oak 41mm Chronograph Watch Push Button
- Fit for Model Number: 26315ST.OO.1256ST.01; 26320OR.OO.D002CR.01; 26331OR.OO.D315CR.01; 26331ST.OO.1220ST.03; 26331ST.OO.1220ST.01...
- Quantity: 1 piece
- Note: This watch part is top-quality brand new aftermarket replacement product. Please do not confuse them with genuine part.
- 70-hour power reserve
- 4 Hz frequency, or 28,800 vibrations per hour
- 40 jewels and 381 parts
- 32 mm total diameter and 6.8 mm thickness
These are AP’s stated specifications, not results from timing or movement testing. Flyback chronograph operation is the key functional distinction named for this calibre; the available information does not provide a hands-on assessment of its operation.
26240ST versus the earlier 26331ST
Moda Communities’ reference library describes the 26240ST as introduced in 2022 and as the successor to the 41 mm 26331ST. In that source’s comparison, the 26240ST uses calibre 4401 and has a 70-hour reserve, while the earlier 26331ST uses calibre 2385 and has around 40 hours. This is secondary-source model history, not confirmation from AP documentation; see the Moda reference library.
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Rank #3
- VERIFY YOUR WATCH MODEL & MEASURE THE CORRECT SIZE USING A RULER – Watch Parts Are Model and Size Specific. Please Verify Compatibility Before Purchasing.
- Compatibility & Size: Watch Band Bracelet, compatible with Audemars Piguet Royal Oak Offshore Safari Stainless/S, Royal Oak Offshore models.
- Ensure Perfect Fit: Verify the size, color, and model compatibility with your specific watch before purchasing to ensure a perfect fit and avoid returns or exchanges.
- Compatibility Check: Double-check your watch's requirements and compatibility details to ensure the product meets your needs. This will help you avoid any issues with returns or exchanges.
- Aftermarket Product: This is an aftermarket/generic made to original factory specs for a precise fit.
When weighing the two, compare the movement and chronograph functions, as well as the exact case and dial configuration, condition and asking price. The information available here does not establish current pricing for the older reference or a matched resale comparison, so it cannot support a claim about which is the better value.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Price, warranty and buying checks
AP’s US page listed the blue-dial 26240ST.OO.1320ST.05 at $44,400 in the search result retrieved on October 7, 2026. This is a time-sensitive manufacturer list price for that reference, not a verified secondary-market range or a prediction of what a buyer should pay. Current price and availability should be confirmed with AP.
The product result states a two-year manufacturing-defect warranty subject to AP’s International Sales Warranty. It also describes five-year warranty applicability for AP watches bought through its authorized network from January 1, 2017, subject to that warranty’s terms. For a particular pre-owned watch, confirm eligibility and remaining coverage with AP using its purchase records; the listing does not establish coverage for every resale.
Phillips’ Hong Kong Watch Auction XV catalogue records one historical 26240ST.OO.1320ST.01 lot as a 41 mm Royal Oak Chronograph with calibre 4401 and accompanying papers, manual, literature, box and packaging. That is a description of one auction lot, not a standard inventory of what comes with every watch; see the Phillips catalogue entry.
Quick Recap
Best Value
- Wacth Band Screw Tube Replacement for the Audemars Piguet Royal Oak Offshore watch case which has 28mm straps.
- It fit all version of Royal Oak Offshore Chronograph including Safari, Alingi, Polaris, Barrichello, Orchard Road, Arnold , Montoya, Jay-Z, Volcano, Offshore Dual Time, Sincere, Rodeo Drive, Monte Napoleone, Worth Avenue, Tantalum, Royal Oak Offshore Scuba Wempe, Royal Oak Offshore Scuba La Boutique in All Versions.
- Size: 28mm
- Packing: 2 pcs tubes and 2 pcs screws
- Material: Stainless Steel
- Match the full reference and dial to the listing you are considering.
- For a pre-owned example, assess its condition and included documents and accessories directly with the seller.
- Confirm any claimed AP warranty with AP rather than relying on the model name or seller description.
- Compare resale offers only when date, condition and geography are sufficiently alike; the cited manufacturer list price does not provide that comparison.
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
