BBSF Edition — Integrated Steel Bracelet
The Audemars Piguet Royal Oak Tourbillon Extra-Thin 26512ST presents a significant mechanical challenge for replica manufacturers. This BBSF edition is recognized within the horological community for its integration of a functional hand-wound tourbillon mechanism. It establishes a technical benchmark for collectors evaluating high-complication alternatives to standard three-hand references.
Powering this piece is a clone of the Calibre 2924, featuring a true rotating tourbillon cage at 6 o’clock. Unlike open-heart balance wheels, this mechanism operates as a functional tourbillon, rotating on its axis. The hand-wound architecture dictates a power reserve of Approximately 36 hours, requiring consistent manual winding to maintain optimal amplitude.
The 41mm case is constructed from standard 316L stainless steel, featuring the signature brushed and polished alternating finishing across the bezel and midcase. The black dial features the correct petite tapisserie pattern, though the depth of the guilloché is slightly shallower than genuine. The integrated bracelet fit remains tight at the lugs, minimizing endplay.
- Movement: Calibre 2924 Clone (Hand-Wound) — Approximately 36 hours
- Case Material: 316L Stainless Steel, 41mm diameter, 50.5mm lug-to-lug, [unconfirmed] weight
- Bezel: 316L Stainless Steel, brushed with polished chamfers
- Crystal: Scratch-resistant sapphire with colorless AR coating
- Bracelet: Integrated 316L Stainless Steel, brushed finish, AP double deployant clasp
- Water Resistance: 30m Stated — professional pressure test recommended before swimming
This reference is suited for the collector who values mechanical complexity and understands the maintenance requirements of a manual-wind tourbillon. Its larger wrist presence and delicate movement make it appropriate for controlled environments rather than rigorous daily wear.







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