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subir fotos onlineFor the Only Watch 2015 charity auction, F.P. Journe has created this Tourbillon Souverain Bleu, a unique, tantalum-cased watch.
Participating for the first time, it's the first tourbillon watch with a case made entirely in tantalum. It features a vivid blue chrome dial that reflects light like a mirror, changing its character according to the color of incident light.
The in-house F.P. Journe movement is made of 18 karat rose gold, and is fitted with a
remontoire - a constant force device.
In mechanical horology, a remontoire, (from the French remonter, meaning 'to wind') is a small secondary source of power, a weight or spring, which runs the timekeeping mechanism and is itself periodically rewound by the timepiece's main power source, such as a mainspring. It was used in precision clocks and watches to place the source of power closer to the escapement, thereby increasing the accuracy by evening out variations in drive force caused by unevenness of the friction in the geartrain. In spring-driven precision clocks a gravity remontoire is often used to replace the uneven force delivered by the mainspring running down by the more constant force of gravity acting on a weight. In turret clocks it serves to separate the large forces needed to drive the hands from the modest forces needed to drive the escapement which keeps the pendulum swinging. A remontoire should not be confused with a maintaining power spring, which is used only to keep the timepiece going while it is being wound.
