Caliber 2460 R31L
This new 275-part self-winding 2460 R31L movement with its 40-hour power reserve drives the hours and minutes hands, the precision moon-phase displays as well as the retrograde date. The functions are adjusted via the crown, thus ensuring optimal user friendliness. Its first position the crown serves to wind the watch, while pulling it out to its the second notch enables adjustment of the date by turning it clockwise, and the moon phase by a counter-clockwise rotation. The third and last position controls time-setting. The movement may be admired through a transparent sapphire crystal case-back.
Developed and manufactured by Vacheron Constantin.
Hours, minutes, retrograde date, precision moon phase, age of the moon
A lyrical complication
Shown by means of a gold disc, the age of the Moon – meaning the number of days that have elapsed since the last new moon – can be read off through an opening in the lower half of the dial. This complication is displayed in accordance with the real cycle of the Moon around the Earth, which amounts to exactly 29 days, 12 hours and 45 minutes. This sophisticated mechanism requires only one correction every 122 years.
A useful and elegant function
The retrograde date indication appears in the upper part of the dial. A central blackened gold hand – whose colour is achieved by oxidation – tipped with an openworked arrow moves forward in one-day increments. Once the month has elapsed, the hand returns to its initial position on the 1 numeral by means of a retrograde system and begins running along the same path.
The silvered opaline dial, subtly raised around the rim, features tapered applied hour-markers in pink or white gold depending on the versions, as well as a circular “pearl” minute-track. The emblematic Maltese cross on the dial, the slim hands, as well as the pin buckle of the alligator strap, are all crafted in pink or white gold according to the model.
Patrimony moon phase and retrograde date
Hallmark of Geneva certified watches
- Case18K white gold/5N 18K pink gold
42.5 mm in diameter, 9.7 mm thick
Transparent sapphire crystal caseback
- DialSilvered opaline
Convex external zone
18K white gold/5N 18K pink gold moon disc
18K white gold/5N 18K pink gold applied hour-markers and 18K gold circular “pearl” minute-track
- Strap/braceletBlack Mississippiensis alligator leather with alligator inner shell, large square scales
- Buckle/clasp18K white gold /5N 18K pink gold
Polished half Maltese cross-shaped
Caliber 2460 R31L
- MovementMechanical self-winding
- Diameter27.2 (11½’’’)
- Power reserveApproximately 40 hours
- Frequency4 Hz (28,800 vibrations/hour)
- Number of components275
- Number of jewels27
Copernicus celestial spheres 2460 RT
Our astronomical watches
From the 19th century to the present day, the history of astronomical complications at Vacheron Constantin has been punctuated by a longstanding tradition of horological expertise.
Discover the entire range of astronomical watches in the various collections of the Manufacture.