BBSF Edition — Integrated Steel Bracelet
The BBSF execution of the Royal Oak Perpetual Calendar 26613ST represents a significant technical benchmark in replica horology, specifically addressing the complex 5134 caliber architecture. While standard models focus on three-hand simplicity, this release integrates a functional calendar module operated via recessed case pushers. Collectors evaluate this specific reference for its distinct dial, which BBSF has color-matched to the boutique-exclusive genuine counterpart.
At the core of this piece is the clone caliber 5134 automatic movement, engineered to support the extensive array of calendar functions. Unlike standard base clones, this movement utilizes a modular construction to drive the day, date, month, and moonphase indicators. Power reserve is strictly dictated by the modular drag, yielding approximately 36 hours of reliable operation when fully wound.
The case is machined from standard horological stainless steel, measuring 41mm in diameter with a verified thickness of 11.4mm and an overall stated measurement of 186.1mm. The signature brushed/polished alternating finishing is executed with high fidelity across the octagonal bezel and integrated bracelet fit. The dial features the recognizable Grand Tapisserie pattern, rendered in a Turquoise Blue tone that closely approximates the genuine lacquer.
- Movement: Clone Caliber 5134 Automatic — Approximately 36 hours
- Case Material: Stainless Steel, 41mm diameter, 186.1mm specified measurement
- Bezel: Stainless steel with brushed top and polished chamfers
- Crystal: Scratch-resistant sapphire with colorless AR coating
- Bracelet: Integrated stainless steel with AP folding clasp
- Water Resistance: 30m stated — professional pressure test recommended before swimming
This reference appeals to the advanced enthusiast who understands the technical constraints of a mechanical perpetual calendar replica. It commands presence as a statement piece while demanding careful adherence to setting protocols.


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