Vacheron Constantin Patrimony Perpetual Calendar 43175/000R-9687

About This Watch

The Vacheron Constantin Patrimony Perpetual Calendar is among the thinnest perpetual calendars ever produced, a remarkable achievement considering the mechanical complexity required. The caliber 1120 QP is based on the legendary Jaeger-LeCoultre 920 base, over which Vacheron Constantin has added its own perpetual calendar module, resulting in a movement just 4.05mm thick. This allows the entire watch to measure only 8.9mm, extraordinary for a perpetual calendar that tracks day, date, month, moon phase, and leap year cycle. The mechanism will accurately display the correct date, including months of 28, 30, and 31 days, without manual correction until the year 2100, when the Gregorian calendar skips a leap year. The silver opaline dial arranges all displays with exceptional symmetry and legibility: day and month in apertures, date by a central hand, moon phase at 6 o'clock, and leap year at 3 o'clock. The 18k rose gold case and refined Patrimony design language ensure this grand complication maintains the elegance of a simple dress watch, proving that mechanical complexity need not come at the expense of visual restraint.