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Lange & Söhne – Lumen

GRAND LANGE 1 MOON PHASE “Lumen” Presented in a limited edition of 200 watches, the GRAND LANGE 1 MOON PHASE “Lumen” combines a brilliant moon-phase display with a mystically luminous outsize date that reflects the characteristic style of the brand icon.

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 dial of the new model 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. 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.

GRAND LANGE 1 MOON PHASE “Lumen” Ref. 139.035F

Lange manufacture calibre L095.4, manually wound, crafted to the most exacting Lange quality standards, decorated and assembled by hand; precision-adjusted in five positions; plates and bridges made of untreated German silver; balance cock engraved by hand

Movement parts


Screwed gold chatons

Lever escapement

Shock-resistant screw balance; balance spring manufactured in-house with a frequency of 21,600 semi-oscillations per hour, precision beat adjustment system with lateral setscrew and whiplash spring

Power reserve
72 hours when fully wound

Time indicated in hours, minutes and subsidiary seconds with stop seconds; power-reserve indicator; luminous outsize date; moon-phase display

Operating elements
Crown for winding the watch and setting the time, one button for quick outsize date corrections, recessed push piece for correcting the moon-phase display

Case dimensions
Diameter: 41.0 millimetres; height: 9.5 millimetres

Movement dimensions
Diameter: 34.1 millimetres; height: 4.7 millimetres

Crystal and back
Sapphire crystal (Mohs hardness 9)


Basic dial (outer ring, hours, minutes, subsidiary seconds) in solid silver, black-oxidised; semi-transparent sapphire crystal; outsize date, luminous Roman numerals and markers for the time and power-reserve indicator as well as moon-phase display details

Rhodiumed gold, luminous

Hand-stitched alligator leather strap, black

Platinum deployant buckle

Limited edition
200 watches

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