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Jaeger-LeCoultre - Master Ultra Thin Perpetual

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The new Jaeger-LeCoultre Master Ultra Thin Perpetual expresses beauty and harmony. The pure and classic design makes this timepiece indisputably elegant.

The clear layout of the dials - In addition to the hour, minute and central seconds hands - comprises three counters dedicated to the perpetual calendar displays: the first at 9 o’clock for the day of the week; the second at 3 o’clock for the fourth; and the third at 6 o’clock for the month. Jaeger-LeCoultre’s distinctive signature appears below the moon phase at 12 o'clock. A full four-digit display appears through a small aperture at 7 o’clock.

The new model comes in three variations distinguished by the material or colour of the case.

The first features an 18-carat pink gold case (ref. Q1302520) framing an eggshell-white dial and applied polished gold indexes, while the 18-carat white gold version (ref. Q1303520) comes with a grained silver-toned dial and applied black nickel indexes. 

The steel model  (ref. Q130842J) is available exclusively from Jaeger-LeCoultre boutiques and comes with a sunburst silver-toned dial and polished applied indexes.

The 39 mm case, characterized by the streamlined lugs and the slim bezel, has a thickness of just 9.2 mm  and houses the Manufacture's Calibre 868 visible through the sapphire crystal case-back.

A single corrector located on the side of the case is enough to change all the indications in accordance with a remarkably simple principle: one press moves the perpetual calendar one day forwards, while any additional changes required to keep step with the vagaries of the Gregorian calendar take place automatically. The watch mechanism takes account of the unequal length of months with 28, 30 or 31 days. Every four years, it will just as naturally display the 29th of February that is associated with leap years. It will thus require no manual adjustment before March 1st 2100, since century years are an exception to the four-year cycle governing leap years. Meanwhile, the moon-phase display will faithfully portray the various states of our satellite over the next 122 years.

Finally, just above the dial centre, a small rectangular window, generally in the same shade as the background, turns gradually red as evening falls. 

It indicates the period (between 10 PM and 4 AM) during which it is preferable to avoid any adjustments in order to avoid potentially damaging the gear wheels that are already engaged in preparing the change of indication that takes place daily at exactly midnight.

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