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.
|Leather strap||:|| |