Vacheron Constantin caliber 1860
Caliber 1860 was introduced in 2017. This hand-wound movement is the first Grande Sonnerie made by Vacheron Constantin. It consists of 727 parts including 74 jewels, and measures 37mm across at a height of 9.1mm. The power reserve for the movement is 72 hours, while the strike work has a power reserve of approximately 20 hours.