Vacheron Constantin · Automatic

2460 R31L/270

A self-winding movement combining a retrograde date with a precision moon phase, made for the Patrimony. The moon disc is geared to the lunar month of 29 days, 12 hours and 45 minutes closely enough to need correcting only about once in 122 years. The rotor is openworked into a Maltese cross in 18-carat gold, and the calibre carries the Hallmark of Geneva.