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Description
BBSF Audemars Piguet Royal Oak Perpetual Calendar 26574ST
A triumph of replica engineering, delivering a fully operational calendar module within a precisely machined 11.3mm case profile.
Powered by Clone Calibre 5134
The engine driving this complex reference is a customized Clone Calibre 5134 automatic movement. Unlike standard three-hand clones, this caliber incorporates a specialized module to actuate the week, day, date, month, leap year, and moon phase displays. The movement utilizes a bidirectional winding rotor decorated with AP engravings, and the bridges feature simulated c么tes de Gen猫ve finishing. Due to the mechanical drag of the calendar gears, the mainspring delivers a shorter but stable power curve, requiring regular wear or winding to maintain the calendar synchronization.
Regulated to approximately 卤10��15 seconds per day. The high-friction calendar module can cause slight variations in amplitude as multiple wheels engage near midnight.
- �� Power Reserve: Approximately 36 hours
- �� Complications: Full calendar (Day, Date, Month, Leap Year, Week) and Moon Phase
- �� Winding Direction: Bidirectional
Technical Specifications
Measuring exactly 41mm in diameter and an impressive 11.3mm in thickness, the case delivers a substantial 185.2g weight. The brushed/polished alternating finishing is executed with sharp transitions along the chamfers.
The dial features the iconic large checkered pattern with deep blue sub-dials. The printing on the calendar rings is crisp, and the applied hour markers are properly aligned and filled with luminous material.
The signature octagonal bezel features a vertical brushed finish, secured by eight perfectly recessed, polished hexagonal screws that align correctly with the dial perimeter.
The integrated bracelet fit is tight at the lugs, featuring solid links with polished bevels. The double-deployant AP clasp engages securely with minimal endplay.
Why BBSF for This Reference?
Many collectors ask: ��Why choose BBSF over other factories attempting the Perpetual Calendar?��
BBSF has prioritized functional integrity and case proportions. While the genuine 26574ST measures an ultra-thin 9.5mm, achieving a fully functional clone complication module inherently requires more vertical space. BBSF managed to engineer this into an 11.3mm profile��a remarkable feat that prevents the watch from looking bloated on the wrist. Furthermore, the 185.2g weight provides a tactile, premium feel that closely mimics the heft of a genuine grand complication piece.
Full Disclosure: The moon phase disc uses a standard printed substrate rather than the high-end aventurine glass found on the genuine, resulting in a slightly flatter appearance under direct light.
Data Sheet
| MODEL REFERENCE | 26574ST.OO.1220ST.02 |
| FACTORY / VERSION | BBSF Edition |
| MOVEMENT | Clone Calibre 5134 |
| CASE MATERIAL | 316L Stainless Steel |
| WEIGHT & THICKNESS | 185.2g | 11.3mm |
| CRYSTAL & LUME | Sapphire with AR | Standard Super-LumiNova |
| DIMENSIONS | 41mm � 51.5mm � 11.3mmManual measurements �� minor tolerances apply. |
| WATER RESISTANCE | 30m �� professional pressure test recommended before swimming |
Collector Q&A
Q: Do all the calendar functions actually work on this BBSF clone?
A: Yes, the BBSF Clone Calibre 5134 features a functional complication module. The day, date, month, leap year, and moon phase indicators are all operational and adjustable via the recessed pushers on the side of the case, unlike earlier decorative versions.
Q: How accurate is the case thickness compared to the genuine 26574ST?
A: The genuine model is an ultra-thin 9.5mm. This BBSF edition measures 11.3mm. It is thicker in order to accommodate the mechanical clone complication module. However, at 11.3mm, it still wears comfortably and maintains the classic Royal Oak integrated aesthetic.
Q: Is the moon phase indicator a true 29.5-day cycle?
A: No. The moon phase on this specific clone movement is linked to the date wheel, typically completing a full rotation over 31 days rather than the true 29.5-day synodic month found on the genuine Audemars Piguet caliber.
Q: What is the most notable flaw on this specific BBSF release?
A: The primary tell lies in the moon phase disc material. The BBSF clone uses a standard printed disc with a flat finish, which lacks the subtle, starry shimmer of the high-end aventurine glass used by Audemars Piguet under direct lighting.
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