Jaeger Le Coultre- Grand Master Tourbillion

Jaeger-LeCoultre celebrates the opening of its Heritage Gallery with the release of the Master Grand Tourbillon, an exclusive series equipped with a fascinating tourbillon mechanism. Made up of 78 parts weighing barely 0.28 grams in all, the grade 5 titanium tourbillon carriage spins elegantly on its axis once a minute. The date indication is adjustable in both directions and makes a bigger jump between 15 and 16 so as not to spoil the view of this magnificent technical accomplishment. In addition to the prestige of the standout complication, the automatic movement also features a dual time-zone display.

For this limited edition, Jaeger-Lecoultre has devised a balance with a 11.5 mg x cm2 inertia capable of supplying the automatic movement with the energy it needs to keep the carriage in motion and to perform the characteristic 28,800 vibrations per hour expected from a high- precision movement. Among the screws arranged around its rim, four of them serve to make adjustments. This technique ensures constant adjustment over time that is unperturbed even by shocks. Any losses in energy due to friction are also reduced by the use of spyr-type gear-wheel teeth with a profile specially designed to ensure regular transmission of force. The lever is also more compact so as to fit into the limited space of the tourbillon carriage. Finally, the automatic movement is wound in one direction only, in harmony with lengthy research that has shown that, once on the wrist, a watch winds twice as fast this way than in the bidirectional mode.

Technical Data:

Movement	:	Mechanical automatic winding Jaeger-LeCoultre Calibre 978, crafted and decorated by hand 28,800 vibrations per hour 48-hour power reserve 302 parts 33 jewels 7.05 mm high 22-carat single-piece oscillating weight, openworked and decorated with relief engravings
Functions	:	local time enabling fast adjustment on both directions (travel time zone) date hand synchronised with local time, adjustable in both directions 24-hour reference time indication minutes tourbillon regulator with seconds indication
Dial	:	sunburst black base with applied rhodium-plated gold numerals and hour-markers, 11 luminescent dots
Hands	:	hour and minute: Alpha type in rhodium-plated brass, luminescent date: rhodium-plated brass with double red-varnished triangle reference time: rhodium-plated brass
Crowns	:	1 crown to start the watch and to adjust local time, reference time, minute and date
Case	:	ø 43 mm in 950 platinum cambered sapphire crystal, hardness N°9 sapphire crystal case-back revealing the movement water-resistant to 50 metres
Leather strap	:	22/20 in matt alligator leather and 18-carat white gold folding clasp
Reference	:	platinum 950: Q166 64 70

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