Da Vinci Tourbillon 3752

Hand-woundManual windingWinding a mechanical watch’s mainspring by turning the crown. Some automatic movements also allow manual winding. Da Vinci combining perpetual calendarPerpetual calendarA calendar mechanism that accounts for different month lengths and leap years., chronographChronographA watch function for starting, stopping and resetting an elapsed-time measurement independently of the ordinary time display. and a tourbillonTourbillonA rotating cage carrying the escapement and balance, devised to average positional rate errors caused by gravity in upright pocket watches. visible at 6.