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.
The watches of A. Lange & Söhne are known for being elegant, sophisticated, elaborate and understated – not exactly “cool”. But with the Grand Lange 1 Moon Phase “Lumen” the watch manufacturer presented a watch, being all what we expect from A. Lange & Söhne while being – well – cool.
The dial of the new model is made of blackened silver with ample apertures and black-tinted, semi-transparent sapphire-crystal glass. The special clothing 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 2 Moon Phase “Lumen” has a disc made of glass. Initially, its surface is treated with a 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.
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. Between one and four o’clock A. Lange & Söhne placed a big power-reserve indicator, at five o’clock there’s a small second.
The watch is powered by he manually wound calibre L095.1. It is elaborately finished, the three-quarter plate made is decorated with Glashütte ribbing. The large mainspring barrel delivers power for 72 hours.
The calibre is housed in a 41-millimetre platinum case.
The Grand Lange 1 Moon Phase “Lumen” is a limited edition of only 200 watches.