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SIHH preview – the Grand Lange 1 Moon Phase by A. Lange & Söhne

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December 2013

Although the Saxony-based manufacture has already presented twelve models with a moon phase complication since it restart, the new Grand Lange 1 Moon Phase model is the first to be the focus of such lavish attention on the moon phase display.

The solid gold lunar disc depicts the night sky using a patented coating process developed by the brand, which uses interference effects to prevent all non-blue hues of light from falling on the display. The result is an intense blue background that glistens with more than 300 individual stars of different sizes that have been cut by laser on to the disc.

Grand Lange 1 Moon Phase by A. Lange & Söhne
Grand Lange 1 Moon Phase by A. Lange & Söhne

A similar attention to detail has also been applied behind the scenes, on the Lange manufacture calibre L095.3 movement . While many moon phase complications are based on a 29.5 day lunar cycle, which is a deviation of 44 minutes and 3 seconds per cycle compared with the exact period of 29 days, 12 hours, 44 minutes and 3 seconds (and adds up to a full day every two and a half years), the seven-gear transmission in the Lange movement reduces this discrepancy to less than one minute per lunar cycle. This means that the moon phase display only has to be corrected by one day in every… 122.6 years!

Calibre L095.3 by A. Lange & Söhne
Calibre L095.3 by A. Lange & Söhne

The imperceptible yet continuous movement of this moon phase display is framed by the typical Lange & Söhne configuration of off-centre hour and minute subdial, big date with twin windows, separate small seconds subdial and a generous power reserve indicator for the manually-wound movement, which offers an impressive power reserve of 72 hours using only one mainspring barrel.

This unmistakable face is housed in a 41mm diameter case available in yellow gold, pink gold or platinum with matching leather straps.