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Description
APSF Audemars Piguet Royal Oak Chronograph 26240ST
The definitive benchmark for integrated bracelet tolerances and true 12.0mm case geometry.
Powered by Caliber 4401 Clone
The engineering focal point of this reference is the custom-built Caliber 4401 clone. Unlike legacy replicas reliant on modular chronograph plates stacked atop base movements, this caliber features a fully integrated column-wheel architecture. This enables the authentic flyback chronograph function and ensures correct sub-dial spacing without compromising case thickness. The rotor is finished with accurate engravings and perlage, visible through the sapphire exhibition caseback.
�� Accuracy Profile:
Regulated to an average variance of 卤10��15 seconds per day. The integrated chronograph module maintains stable amplitude even when the complication is engaged.
- �� Power Reserve: Approximately 36 hours
- �� Complications: Flyback chronograph, date, small seconds
- �� Winding Direction: Bidirectional rotor winding
Technical Specifications
THE BUILD316L Stainless Steel
Precisely machined to 41mm with a verified 12.0mm thickness. The 51.5mm lug-to-lug distance features the updated 50th-anniversary wider bevels for enhanced ergonomics.
THE DIALGrande Tapisserie Bleu Nuit
Boasts crisp square guilloch茅 with correct concentric snailing inside the sub-dials. White gold-plated hands are filled with highly legible Super-LumiNova against the Bleu Nuit backdrop.
THE BEZELOctagonal 316L Steel
Exhibits accurate vertical brushing with deeply polished flanks. The eight hexagonal white gold-plated screws are recessed to the correct depth.
THE BRACELETIntegrated Steel
Features tight end-link tolerances and accurate alternating brushed/polished finishing. Secured by a reliable double deployant clasp mechanism.
Why APS Factory for This Reference?
Many collectors ask: ��Why not ZF Factory?��
While ZF produces excellent standard Royal Oak models, APSF is the definitive choice for the 26240 chronograph. The primary advantage is APSF��s implementation of the 4401 clone movement, which allows the case to maintain a strict 12.0mm thickness. Older or alternative factory versions relying on modified 7750 movements suffer from an inherently thicker case profile and incorrect sub-dial spacing. APSF also currently leads in integrated bracelet articulation and end-link fitment.
Full Disclosure: The winding rotor on the 4401 clone can be slightly audible during vigorous wrist movement��a common characteristic of complex clone chronograph calibers.
LIVE PREVIEW
Data Sheet
| MODEL REFERENCE | 26240ST.OO.1320ST.01 |
| FACTORY / VERSION | APS Factory Edition |
| MOVEMENT | Caliber 4401 Clone Chronograph |
| CASE MATERIAL | 316L Stainless Steel |
| WEIGHT & THICKNESS | 170g | 12.0mm |
| CRYSTAL & LUME | Sapphire with Colorless AR | Super-LumiNova |
| DIMENSIONS | 41.0mm � 51.5mm � 12.0mmManual measurements �� minor tolerances apply. |
| WATER RESISTANCE | 50m Stated rating �� professional pressure test recommended before swimming |
Collector Q&A
Q: Does the flyback chronograph function work like the genuine 4401 caliber?
A: Yes. The APSF custom 4401 clone movement features a true column-wheel architecture, allowing the flyback function to operate correctly. You can reset the chronograph while it is running without stopping it first.
Q: How does the case thickness compare to the genuine 50th-anniversary model?
A: This APS Factory edition measures exactly 12.0mm thick, perfectly aligning with the genuine 26240 geometry. This is a significant horological upgrade over previous iterations that relied on modified 7750 movements and measured closer to 14mm.
Q: Is the dial color accurate to the OEM Bleu Nuit tone?
A: The Grande Tapisserie dial captures the deep Bleu Nuit tone exceptionally well under natural light. However, under extremely harsh artificial lighting, the sunburst effect may appear marginally flatter compared to the proprietary OEM lacquer process.
Q: Are there any known quirks with the APSF 4401 movement?
A: The winding rotor on the 4401 clone can be slightly audible in quiet environments. Additionally, we recommend avoiding excessive manual winding via the crown; simply wind it 15-20 turns to start, and let the bidirectional rotor maintain the 36-hour power reserve naturally.