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Pre-SIHH 2015: Jaeger-LeCoultre - Duometre Spherotourbillon Moon

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The Duomètre a Sphérotourbillon from Jaeger-LeCoultre was one of the most exciting novelties of 2012 (we wrote about it here). The watch integrated a multi-axis tourbillon, machined from a single block of titanium, into the sophisticated Duométre movement architecture, based on the combination of two watch mechanisms - one for the time and one for the complications - each with its own source of energy but synchronized by a single regulator.

Jaeger-LeCoultre is now announcing a new Spherotourbillon model that will be fully showcased at the upcoming Salon International de la Haute Horlogerie (SIHH) 2015: the Duomètre Sphérotourbillon Moon, a limited edition of 75 pieces.

This new masterpiece comes with a moon-phase indicator positioned inside the main sub-dial. In line with the Duométre philosophy, one main spring powers hours, minutes and seconds while the other main spring powers the moon-phase complication. Each main spring has its own power reserve indicator: at 1:30 with a blued hand for the time and at 5:30 with a gilt hand for the moon phase. At 12 o'clock we find the 24-hour indication.

Pre-SIHH 2015: Jaeger-LeCoultre Duometre Spherotourbillon Moon

Jaeger-LeCoultre remarks the extreme precision of the moon-phase indication which, if regularly wound, would experience only one day of deviation every 3887 (!) years.

The small seconds, displayed at 6 o'clock, are featured with a complex flyback function which allows the wearer to reset the seconds hand to zero by just pressing the a push-button at 2 o'clock.

Pre-SIHH 2015: Jaeger-LeCoultre Duometre Spherotourbillon Moon

The manually-wound movement, Calibre 389, is crafted, assembled and decorated by hand with nickel silver bridges and mainplate. Beating at 21,600vibrations per hour and offering 50 hours of power reserve, the movement is comprised of 476 parts. The Sphérotourbillon alone features 105 parts for a total weight of 0.518 grams.

The tourbillon carriage performs a complete turn every 30 seconds with two combined movements - one around its axis and another around a second axis inclined at a 20° angle - which is a pleasure to admire.

Pre-SIHH 2015: Jaeger-LeCoultre Duometre Spherotourbillon Moon

The white gold case of the Jaeger-LeCoultre Duometre Spherotourbillon Moon has a diameter of 42 mm with a thickness of 14.3 mm. The silvery-white dial is rich of indications but still very clean. The Spherotourbillon is beautifully framed by two three-step stairs in satin-finished nickel silver, a detail which we really like.

Pre-SIHH 2015: Jaeger-LeCoultre Duometre Spherotourbillon Moon

- Check out more SIHH 2015 novelties here

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