2026 Vacheron Constantin 4307V/220R-237C Overseas Perpetual Calendar Ultra Thin Skeleton 41.5mm

An exceptionally rare off-catalog creation, the Vacheron Constantin Overseas Perpetual Calendar Ultra-Thin Skeleton Ref. 4307V/220R-237C combines high complication watchmaking with striking gem-setting in an elegant 41.5mm 18K 5N pink gold case. Its openworked dial reveals the intricately finished automatic Calibre 1120 QPSQ/1 beneath blue-accented perpetual calendar displays indicating the day, date, month, leap year, and moon phase. Framing the skeletonized architecture is a spectacular factory-set bezel of baguette-cut blue sapphires, creating a vivid contrast against the warm pink gold case and integrated bracelet. Measuring just 8.1mm thick despite its perpetual calendar complication, this extraordinary Overseas exemplifies Vacheron Constantin’s mastery of ultra-thin watchmaking while offering a highly exclusive configuration outside the brand’s standard collection.