This year, Vacheron Constantin adds a new pink gold version of Patrimony perpetual calendar model highlighted with an elegant slate-colored opaline dial. Unveiled at SIHH 2017, it houses the legendary Caliber 1120 QP, an ultra-thin mechanical self-winding movement revealing the elegance and finesse of the Patrimony collection.
Caliber 1120 QP developed and crafted by Vacheron Constantin drives the hours and minutes hands, the moon phase at 6 o’clock along with a perpetual calendar displaying the day of the week in a counter at 9 o’clock, the date in a counter at 3 o’clock, the month and leap year in a 48-month counters at 12 o’clock.
Acknowledged by connoisseurs as one of the most iconic existing perpetual calendars, it will smoothly cope with all the vagaries of the calendar without requiring any corrections until March 1st 2100.
Unlike simple calendars requiring manual correction after every month with less than 31 days, the perpetual calendar takes account of the leap-year cycle with its 31-, 30- and 28-day months, as well as the quadrennial recurrence of February 29th.
This sophisticated function requires prodigious miniaturisation to mechanically adjust it so as to keep track of calendar irregularities. This miniaturisation has been taken to extremes in order to achieve an ultra-thin perpetual calendar.
Vacheron Constantin Caliber 1120 QP measures just 4.05 mm thick, beats at the frequency of 2.75 Hz (19,800 vibrations per hour), and has a 40-hour power reserve. The oscillating weight cut out in the shape of a Maltese cross further embeds the design codes of the Maison at the heart of the movement.
While remaining loyal to the collection’s characteristic elegance and aesthetic purity, this new interpretation is infused with a definite sense of modernity and dynamism.
The slightly convex external zone is adorned with a circular “pearl” minute-track and 18K pink gold applied hour-markers.
The hours, minutes hands and calendar pointers are in 18K pink gold. Setting the finishing touch, the saddle-finish black alligator strap is hand-stitched and secured by a folding clasp in the same metal.
Revolving beneath the dial, the moon disc depicts the heavenly vault in pink gold enhanced by a blue galvanic treatment. Each star has been delicately crafted so as to provide an exact map of the sky.
Fitted with a sapphire back enabling one to admire Caliber 1120 QP, the 41 mm-diameter case is water-resistant to 3 bar (approximately 30 meters).
Model: Vacheron Constantin Patrimony Perpetual Calendar Watch in Pink Gold with Slate-colored Opaline Dial, Reference 43175/000R-B343
Hallmark of Geneva certified timepiece
Caliber 1120 QP
Developed and manufactured by Vacheron Constantin
29.6 mm (12’’’½) diameter, 4.05 mm thick
Approximately 40 hours of power reserve
2.75 Hz (19,800 vibrations/hour)
Perpetual calendar (day of the week, date, 48-month display with leap year indication)
18K 5N pink gold
41 mm diameter, 8.9 mm thick
Transparent sapphire crystal caseback
Water-resistance tested at a pressure of 3 bar (approx. 30 meters)
Convex external zone with circular “pearl” minute-track
18K 5N pink gold applied hour-markers
Black Mississippiensis alligator leather with alligator inner shell, hand-stitched, saddle-finish, large square scales
Clasp: 18K 5N pink gold folding clasp; Polished half Maltese cross-shaped
With watch winder
Delivered with a corrector pen