BBS Audemars Piguet Royal Oak Series, Complex Function Eternal Calendar Wristwatch

BBS Factory's interpretation of the Audemars Piguet Royal Oak Perpetual Calendar combines the sporty signature of the Royal Oak with a complex complication, with day, month, week and moon phase subdials placed on the tapisserie dial.

The perpetual calendar complication is based on a wheel mechanism that accurately calculates leap years and different month lengths without human intervention; This movement divides the dial with four separate sub-displays under the octagonal bezel of the Royal Oak. This division transforms the simple sporty dial into a complex but organized information panel.

In this production of BBS Factory, the symmetrical placement of the sub-dials across the dial and the accessibility of the hidden correction birds on the case side stand out as the main factors that determine the daily usability of the complication. The craftsmanship of the moon phase window also offers a decorative layer that completes this whole.

---

1. Symmetrical Placement of Day, Month and Week Sub-Dials

It is necessary to start the examination from the indicator placement, which is the heart of the complication; The distribution of the four subdials - day, date, month, week - on the dial should be positioned evenly without reducing the visibility of the tapisserie texture; If the subdials are too close together, readability becomes difficult and confusion occurs between the displays.

• In the example examined, the frame thickness of the sub-dials is proportional to the main dial; This proportion ensures that the complex displays form an orderly visual whole rather than being crowded, and the hands of each sub-dial can be clearly distinguished within their own frame.

2. Detail Work of Moon Phase Indicator

The sky blue background and the relief depth of the golden moon figure in the moon phase window constitute the most decorative element of the complication; The sharpness of the figure's edge shows the precision of the printing plate, and the darkness of the ground creates a clear contrast with the figure.

• Moonphase rotation rate: should be adjusted to an accuracy close to the actual lunar cycle; This sensitivity determines how compatible the indicator will remain with the real sky phase in the long term, and regular control ensures the continuity of this harmony.

3. Hidden Correction Birds Next to the Case

In perpetual calendar watches, the adjustment of the indicators is done by small correction birds embedded in the case side surface; It is both an aesthetic and practical necessity for these birds to remain flush with the case surface and allows adjustments to be made without damaging the case profile.

• Compression depth and rebound hardness of the birds: reduces the risk of accidentally touching a different indicator during adjustment; In the sample examined, the position of each bird can be clearly distinguished and the pressing sensation offers consistent resistance.

4. Compatibility of the Octagonal Bezel with the Complication Dial

When the Royal Oak's octagonal bezel is combined with a complex calendar dial, visual balance between case and dial becomes difficult; The alignment of the bezel screws should remain on the same axis as the sub-dial frames of the dial, and this axis alignment should preserve the overall symmetry of the watch.

• In this production, the transition between the bezel and the dial is seamless: despite the complex number of indicators, the case has not lost the simple sporty identity of the Royal Oak, and the polishing level of the bezel screws remains in harmony with the general tone of the dial.

5. Band Connection and General Position on the Wrist

The placement of the Miyota-based high-frequency movement within the case keeps the case thickness at a reasonable level despite the additional layer carrying the complex calendar module; This does not create much bulk on the wrist.

• The connection point of the band to the case: follows an uninterrupted line despite the density of the sub-dials; In this production, the band-case transition preserves the characteristic integrated look of Royal Oak.

6. Integral Harmony of Sub-Dials, Bezel and Case

The common point that stands out in this review is that the symmetrical layout of the four sub-dials combines with the sporty identity of the octagonal bezel and the practicality of the correction birds on the case side, under the same design discipline; Despite the number of complex functions, the dial offers a tidy appearance, not crowded. The decorative richness of the moon phase window also contributes to the dial without disrupting this order.

---

General Evaluation

BBS Factory's rendition of the Royal Oak Perpetual Calendar balances the sporty identity of the octagonal bezel with complex calendar indicators; The symmetry of the subdial and the position of the correction birds support this balance. For collectors looking for a complicated Royal Oak, display readability is the strongest aspect of this production; The workmanship of the moon phase window completes this whole aesthetically.