The Vacheron Constantin Overseas Ultra-Thin Perpetual Calendar was introduced at SIHH 2016. . It is powered by the automatic caliber 1120QP, which features a perpetual calendar. Reference 4300V/000R-B509 was added to the collection in 2019. It features an 18k pink gold case with a diameter of 41.5mm at a height of 8.1mm and a blue dial.
