Franck Muller chronograph calendar perpetual biretro in White gold

The Franck Muller Perpetual Biretro Ref. 7000 CC QP B combines a perpetual calendar, two retrograde indications, a chronograph, and moon phases within a distinctive round case in 18k white gold. Its broad satin-finished bezel and elongated lugs give the watch an architectural presence, while the ribbed case band adds detail in profile. The light silvered dial uses red numerals and blued hands to separate its multiple functions. This example bears the individual number 08 on its solid caseback and is fitted with a red textured leather strap that echoes the dial accents.

Key Specifications

Reference	7000 CC QP B, engraved on the caseback
Model	Perpetual Biretro Chronograph
Individual Number	08
Case	18k white gold, round case with brushed bezel, coin-edge band, elongated lugs, and solid engraved caseback
Dial	Light silvered dial with contrasting red outer numerals, blued hands, and luminous hour and minute hand inserts
Movement	Self-winding mechanical movement with perpetual calendar and chronograph
Calendar	Retrograde weekday on the left; retrograde date on the right; month and leap-year indication at 12
Chronograph	Central chronograph seconds, 30-minute register at 3, and 12-hour register at 9
Moon Phases	Aperture at 6
Calendar Language	English
Crystal	Sapphire
Strap	Red textured leather strap, as fitted

Collector's Note

The defining feature is the bi-retrograde calendar. Rather than rotating through complete circles, the weekday and date hands travel along opposing arcs, then return to their starting positions at the end of each cycle. The weekday scale occupies the left side of the dial, balanced by the date scale on the right. The month and leap-year indication share the upper subdial, leaving the lower section for the moon-phase display. This arrangement makes the calendar visually different from the conventional three-register perpetual calendar, while allowing two dedicated elapsed-time counters to remain clearly identifiable.

The chronograph records up to 30 minutes at 3 and 12 hours at 9, with a central hand reading against the finely divided outer scale. The perpetual mechanism accounts for different month lengths and the leap-year cycle, bringing substantial mechanical complexity to a traditional case form. Franck Muller presents the Perpetual Calendar Chronograph Bi-Retro as an expression of its Master of Complications identity, a designation also engraved on this example. Here, that technical character is matched by restrained white-gold surfaces rather than elaborate external decoration. The contrast between brushed metal, red printing, and the blue moon-phase aperture gives each element a distinct role. The result is a highly individual calendar chronograph whose appeal rests on its unusual display architecture and the interaction of its complications.

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