In 2013, A. Lange & Söhne introduced the GRAND LANGE 1 “Lumen”, a watch with a semi-transparent sapphire-crystal dial that exposes the ingenious disc configuration of the Lange outsize date. It was followed a year later by the GRAND LANGE 1 MOON PHASE with a prominent in-dial moon-phase display that reproduces the lunations with an accuracy of 99.998 per cent. Now, the GRAND LANGE 1 MOON PHASE “Lumen” combines these two remarkable accomplishments in one watch.
A. Lange & Söhne Grand Lange 1 Moon Phase Lumen’
The dial is made of blackened silver with ample apertures and black-tinted, semi-transparent sapphire-crystal glass. The special coating applied to the glass blocks most of the visible light but not the UV spectra that “charge” the luminous pigments on the outsize-date mechanism and cause them to glow in the dark. The tens cross is coated with a white luminous compound and printed with black numerals. Conversely, the units disc, also featuring black numerals, is made of transparent glass and rotates in front of the luminous background of the date aperture.
Different from Lange’s previous moon-phase models with solid-gold lunar discs, the GRAND LANGE 1 MOON PHASE “Lumen” has a disc made of glass. Initially, its surface is treated with a patented coating process. In a second step, a laser is used to cut out 1164 stars and the moon. Thanks to the luminous compound behind the lunar disc, they shimmer with vibrant radiance.
A. Lange & Söhne Grand Lange 1 Moon Phase Lumen’
The large moon-phase display occupies a prominent position on the main dial. Once properly set, it only needs to be corrected by one day every 122.6 years.
Featuring all of the quality highlights of an A. Lange & Söhne timepiece, the manually wound calibre L095.4 is elaborately finished and assembled twice. The three-quarter plate made of untreated German silver is decorated with Glashütte ribbing and sets a dramatic stage for the seven screwed gold chatons. A classic screw balance with a free-sprung balance spring crafted in-house assures excellent rate accuracy. And the large mainspring barrel delivers power for 72 hours. Presented in a limited edition of 200 watches, this model comes in a 41-millimetre platinum case, priced at €69,600 ($75,000).
A. Lange & Söhne Grand Lange 1 Moon Phase Lumen’
