Overseas Ultra-Thin Perpetual Calendar by Vacheron Constantin

A new addition to the Overseas Travellers Collection, this ultra-thin timepiece features a perpetual calendar and moonphase indications.

Its 4.05mm thick movement comprises 276 parts that keep track of calendar irregularities with no need for correction until the year 2100.

Beating at a frequency of 2.5 hertz, it drives the hours and minutes, perpetual calendar – day of the week, date, month and leap year – on a 48-month counter as well as moon-phase functions. It is powered by calibre 1120 QP/1.

Its sapphire crystal case back reveals 22k oscillating weight adorned with a wind rose.

Secured by an18k 5N pink gold folding clasp, it can be interchanged with a dark blue alligator leather or a rubber strap. vacheron-constantin.com