APSF Audemars Piguet Royal Oak Chronograph 26240OR — The Calibre 4401 Benchmark
By abandoning modified base movements in favor of a dedicated clone architecture, APSF has resolved the historic geometric flaws of Royal Oak chronograph replicas.
Powered by Super Clone Calibre 4401
The integration of the Calibre 4401 clone fundamentally alters the physical profile of this replica. Rather than utilizing a thick, modular chronograph module stacked atop a base movement, this caliber is designed from the ground up as an integrated chronograph. This yields the correct sub-dial spacing, a flush date wheel, and enables the case to achieve its verified 12.0mm thickness. The column-wheel mechanism provides a crisp tactile response when actuating the pushers, closely mimicking the mechanical feedback of the genuine article.
⏲️ Accuracy Profile:
Rated at ±10–15 seconds per day. While not as tightly regulated out-of-the-box as a genuine AP, this high-beat 28,800 VPH movement provides stable amplitude and can be regulated by a competent watchmaker for tighter daily variance.
- ✅ Power Reserve: Approximately 36 hours
- ✅ Complications: Fully functional chronograph, running seconds at 6 o’clock, date display
- ✅ Winding Direction: Bidirectional automatic winding
Technical Specifications
THE BUILDRose Gold Plated 316L Steel
Measuring exactly 12.0mm in thickness and weighing a verified 166.6g, the case features meticulous brushed and polished alternating finishing that defines the Royal Oak aesthetic.
THE DIALWhite Grande Tapisserie
The guilloché pattern is sharply executed. While predominantly a crisp white, subtle warm underlying tones can be observed under direct incandescent lighting, complementing the rose gold case.
THE BEZELOctagonal Rose Gold Plated
Secured by eight perfectly aligned, polished hexagonal white gold-plated screws. The vertical brushing on the bezel surface is uniform and precise.
THE BRACELETIntegrated Plated Bracelet
Features exceptional integrated bracelet fitment with minimal endplay. The chamfered edges of the links are highly polished, contrasting with the brushed flat surfaces.
Why APSF for This Reference?
Many collectors ask: “Why not ZF?”
While ZF produces excellent three-hand Royal Oak models, APSF is the undisputed specialist for the 26240 chronograph series. The key differentiator is APSF’s proprietary Calibre 4401 clone. This movement allows APSF to achieve the verified 12.0mm case thickness, whereas rival factories relying on modified 7750 movements often produce cases that are noticeably thicker and suffer from incorrect sub-dial spacing.
Full Disclosure: At 166.6 grams, this 316L stainless steel-based replica is noticeably lighter than the solid 18k rose gold genuine piece. Additionally, the rose gold plating requires careful wear to prevent exposing the steel beneath high-friction areas over time.
Data Sheet
| MODEL REFERENCE |
Royal Oak Chronograph 26240OR |
| FACTORY / VERSION |
APSF Edition |
| MOVEMENT |
Super Clone Calibre 4401 |
| CASE MATERIAL |
Rose Gold Plated 316L Stainless Steel |
| WEIGHT & THICKNESS |
166.6g | 12.0mm |
| CRYSTAL & LUME |
Sapphire with AR Coating | Super-LumiNova |
| DIMENSIONS |
41.0mm × 51.0mm × 12.0mmManual measurements — minor tolerances apply. |
| WATER RESISTANCE |
Stated 50m — professional pressure test recommended before swimming |
Collector Q&A
Q: Does the APSF Calibre 4401 have functional chronograph sub-dials?
A: Yes. Unlike older replicas that used modified 7750 movements with faux sub-dials or incorrect spacing, the APSF Calibre 4401 is a fully integrated clone. All sub-dials (hours, minutes, running seconds) and the sweeping center seconds hand are fully functional.
Q: How does the 12.0mm case thickness compare to the genuine 26240OR?
A: The APSF case measures exactly 12.0mm thick, which is 1:1 with the genuine Audemars Piguet reference. This is a significant technical achievement in the replica market, made possible entirely by the integrated architecture of the clone Calibre 4401 movement.
Q: Is the rose gold plating on the APSF durable for daily wear?
A: The 316L stainless steel base is treated with a high-quality rose gold PVD coating. While highly resistant to normal wear and oxidation, it is still a surface plating. Exposure to harsh chemicals, abrasive surfaces, or heavy friction will eventually show wear on the contact points, particularly on the clasp and sharp bezel edges.
Q: What is the most notable tell or quirk of this specific APSF replica?
A: The primary tell is the physical mass. At a verified 166.6 grams, this stainless steel-based replica is noticeably lighter than the genuine piece, which is cast in solid 18k rose gold. Additionally, the automatic rotor bearing can be slightly more audible during rapid wrist movements than the genuine AP movement.
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