The Vacheron Constantin Overseas Perpetual Calendar Ultra-Thin Skeleton (Ref. 4300V/120G-B946) is a high-complication luxury sports watch crafted in 18k white gold, combining the Overseas collection’s sporty design with one of watchmaking’s most prestigious complications—a perpetual calendar. Introduced in the early 2020s, this model features a skeletonized dial and movement, allowing the wearer to view the intricate mechanics of the watch through the front and the sapphire caseback. The watch measures 41.5 mm in diameter and only about 8.1 mm thick, making it exceptionally slim for a perpetual calendar timepiece. Its elegant yet sporty case includes the distinctive Overseas bezel inspired by the Maltese Cross, a signature emblem of the brand. The combination of brushed and polished finishing on the white-gold case and bracelet gives the watch both luxury presence and everyday versatility. At its heart is the in-house automatic caliber 1120 QPSQ/1, an ultra-thin perpetual calendar movement. This mechanism displays day, date, month, leap year indication, and moonphase, and once properly set it will remain accurate until the year 2100 without manual correction. The movement is beautifully finished and visible through the open-worked dial and transparent caseback, highlighting Vacheron Constantin’s high-end finishing standards and Geneva Seal–level craftsmanship. The skeletonized dial uses blue rings and open architecture to display the calendar functions while revealing the internal bridges and gears beneath. The watch typically comes with an interchangeable strap system, allowing the wearer to switch between a white-gold bracelet, rubber strap, or leather strap without tools, enhancing its versatility as both a dress and sports watch. Key Specifications Model: Overseas Perpetual Calendar Ultra-Thin Skeleton Reference: 4300V/120G-B946 Case: 18k white gold Diameter: 41.5 mm Thickness: ~8.1 mm Movement: Automatic Caliber 1120 QPSQ/1 Power reserve: ~40 hours Functions: Hours, minutes, perpetual calendar (day, date, month), leap year indicator, moonphase Crystal: Sapphire front and caseback Water resistance: 50 m (5 ATM) Market Position This reference sits among the most prestigious luxury sports watches in the industry, often compared with pieces from Patek Philippe and Audemars Piguet, and typically trades well above $120,000 depending on condition and set.