Cool Watch - Jaeger LeCoultre Master Ultra Thin Perpetual Calendar

The perpetual calendar in the old Master Control collection was introduced in 1997 and phased out around 2004. It measured 37 mm in diameter and 10.1 mm in height, and inside ticked calibre 889/440/2. This ‘perpetual instrument’ was based on JLC’s legendary calibre 889/2, which was paired with a perpetual calendar module, and combined that was called cal. 889/440/2.

The model we present currently, was introduced in 2013. It measures 39 mm in diameter and 9.2 mm in height. Inside ticks the new calibre 868. It is a watch slightly larger in diameter, and slimmer in profile. This Ultra-Thin Perpetual features polished rhodium-plated hour markers and small dots for minute markers.

The dial of the Jaeger-LeCoultre Master Ultra Thin Perpetual displays the perpetual calendar indications in a balanced and extremely clear manner: day, month, date, year and moon phase. Only one corrector regulates all the information. Once set, the automatic watch will not need any adjustment until 2100. The perpetual calendar mechanism takes into account the length of each month and counts 29 days for the month of February in every leap year.

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