Carrying the Hallmark of Geneva certification, the 18K rose gold Overseas Ultra-Thin Perpetual Calendar measures 8.1mm in thickness. This is a watchmaking feat, given that the complicated 276-part movement has hours, minutes, moonphase, date, day of the week, month and leap year indications, without needing a correction until the year 2100. One of the slimmest perpetual calendar watches on the market to date, the Vacheron Constantin caliber 1120 QP/1 ultra-thin mechanical, self-winding movement that powers it measures a mere 4.05mm in thickness. The case measures 41.5mm in diameter and has a soft iron casing ring to ensure anti-magnetic protection. It offers 60 hours of power reserve and is water resistant to 150 meters. The silver translucent lacquer dial has 18K gold hands and hour markers that are also highlighted with luminescence. A transparent sapphire caseback reveals the beauty of the finely finished movement and pared-down components.

$79,500, available at Vacheron Constantin in New York, +1 212 317 8964,

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