For the first time in the Maison's history, this new model combines two of the most popular complications, the moon phase display and the tourbillon device, with the iconic Jaeger-LeCoultre jumping hand date display. The Master Ultra Thin Tourbillon Moon is powered by the new calibre 983, a self-winding mechanical movement. To create the Master Ultra Thin Tourbillon Moon, Jaeger-LeCoultre engineers used the 978 movement to develop the new calibre 983, with the addition of the new complications. The triple moon phase indicator, which shows the age of the moon in addition to the phases in both hemispheres, is a further innovation introduced last year. Beating at a frequency of 28,800 vibrations per hour (4 Hz), the calibre 983 offers a power reserve of 45 hours. The Master Ultra Thin Tourbillon Moon is fitted with a 41 mm diameter by 21.1 mm thick Le Grand Rose gold case. New this year, the new rose gold alloy is characterised by an extraordinary brilliance and intensity of colour, and is extremely resistant to fading over time. True to the classic and elegant design codes of Master Ultra Thin, the case is entirely polished, with elongated and bevelled lugs. Complementing the warm tone of the pink gold, the matt white dial provides a sober background that sets off the moon phase indicator and tourbillon device. The lower part of the dial features the tourbillon. A new polished rose gold bridge protects the titanium tourbillon cage (which weighs approximately 0.3 grams with all its parts), making one revolution every 60 seconds. On the back, the extension of the openworked tourbillon bridge further enhances transparency. The openworked pink gold winding rotor, featuring the company logo and a combination of polished and micro-sanded surfaces, offers a clear view of the movement. Like all Jaeger-LeCoultre timepieces, the Master Ultra Thin Tourbillon Moon has an eight-year warranty in addition to the "1,000 Hours Control" certification, one of the most stringent testing protocols in the watch industry.
