Girard-Perregaux Tourbillon 9989

GIRARD PERREGAUX Mod. “1945 Tourbillon” ref.9989 anno 2004

32x32 mm White gold case, shaped, with double sapphire crystal that allows a glimpse of the mechanism on the case back. Skeleton dial with the 3 iconic bridges on the plane below the hands. Original double bracelet with gold clasp closure with logo. Automatic Tourbillon movement cal.GP9600CS. Watch of enormous collectible value and in excellent condition. Complete with box, guarantee, books dedicated to the model, key, cufflink kit, travel case and a 925/1000 silver ring, celebratory, with rubies weighing 33 grams. The term "Tourbillon" is the simplification of "Regulateur à tourbillon", which indicates a particular mechanism, invented by Abraham-Louis Breguet, patented on June 26, 1801. Its purpose is to allow the reduction by compensation of the irregularities of the movement suffered by the watch depending on the position in which it is placed, connected to the action of the Earth's gravity. In short, it consists, in its simplest form, of a cage rotating around a central axis and containing the escapement, the pallet fork and the balance wheel with its hairspring. Thanks to the circular motion, which causes the perpetual movement of the regulating group, the balance wheel behaves as if the watch were rotating along a circumference, that is, cancelling out the advance experienced in one position with the delay experienced in another.