Case material: Carbon; Charge: Manual; Conditions: New Presentation condition : With boxes and all papers; Model: The Quenttin Black Magnesium Price on request Gmtbroker Reference: BlackMagnesium a new chapter opens in the history of watchmaking: a tourbillon movement developed with a power reserve of 744 hours, or 31 days. the "quenttin" caliber 5 with vertical tourbillon the manually wound mechanical movement, entirely manufactured in switzerland, is positioned vertically and oscillates at a rate of 21,600 vibrations per hour. this tourbillon has been replaced in its vertical position according to the original design of its inventor abraham louis breguet, who developed the concept to compensate for the effect of terrestrial gravity in timepieces which at the time were pocket watches. the quenttin's movement is revolutionary in the sense that all the wheels do not revolve around a central arbour, but around several arbours aligned horizontally, like the gearbox in a car engine. the time, hours and minutes, as well as the power reserve, are read on cylinders and not by means of hands. this world premiere with a one-minute vertical tourbillon and 31 days power reserve is one of the most technical jacob & co. the exclusive manually wound jacob & co with seven spin barrels highlight this watch’s uniqueness. the 45 mm timepiece boasts a complex transparent dial, revealing parts of the movement for an added touch of intimacy. also known as: jacob and co quenttin black magnesium, jacob & co black magnesium, jacob&co.black magnesiu