Lange (A.Lange & Söhne) Big Calendar Display Night Light Mystery

Lange (A. Lange & Söhne) GRAND LANGE 1 ‘Lumen’ Limited Edition showcases Lange’s new idea: the translucent dial reveals the first luminous calendar display.

Still legible in the dark: GRAND LANGE 1 ‘Lumen’

   When Lange first introduced the large calendar display that year, it was not only praised, but also set off a wave of brands vying to follow suit. The large calendar with the distinctive style of the asymmetrical dial makes LANGE 1 an undisputed masterpiece. The complex devices that make this famous big calendar display are usually hidden under a solid silver dial, and now GRAND LANGE 1 ‘Lumen’ will show you this mysterious world generously. This platinum case watch is limited to 200 pieces and fully reflects the characteristics shown in the name: some dials are made of translucent sapphire crystal, only the outer ring, hour display, minute display and small seconds dial are made of black silver The sapphire crystal part reveals the first large calendar display dial device that shines in the dark. In addition, time and power reserve are also legible in the dark.

How Lange’s big calendar works

   The Lange Grand Calendar display is inspired by the five-minute digital clock Ferdinand A. Lange made for the Dresden Semper Opera in 1841. In order to use a larger date format, the calendar unit uses two independent display elements like its model: a ring-shaped single-digit dial with 0 to 9 digits advances by one division per day. Only when the transition from the 31st to the 1st will the single digit dial stand still on that day. A ten-digit cross with 1 to 3 numbers and white blank spaces advances one space every ten days. When displayed as 3, the ten-digit cross will advance to the blank space after 2 days. This irregular switching sequence is controlled by two program gears with precisely calculated gear trains.

    How to ensure the best effect of the luminous function after daily switching operations is the technical problem faced when developing the GRAND LANGE 1 ‘Lumen’. Lange’s product R & D engineer came up with the idea to directly engrav the white luminous coating and black numbers on the ten-digit cross disc. The single digit disc was composed of transparent glass with black numbers and rotated on the luminous background. The sapphire crystal part of the dial is treated with a newly developed coating that blocks most of the visible spectrum. As for the invisible UV spectrum, it is not blocked by the coating. Therefore, the numbers on the dial can penetrate enough photon energy to make the turntable device still easy to read.
   This also brought a surprise effect: the scales created by hand on the calendar splint were originally only visible to the watchmaker during assembly, but now watch wearers can also enjoy such exquisite details. These small overlapping circular cloud patterns are created by human hands with small rolling sand nails and are usually hidden under the dial.
   The double-assembled watch factory’s self-made L095.2 movement combines superb craftsmanship and high-level aesthetics, and can also be seen through sapphire crystal
The bottom cover is carefully admired from the other side. Needless to say, GRAND LANGE 1 ‘Lumen’ is impeccable from every angle.
   Just a year ago, Lange gave GRAND LANGE 1 a brand new manual winding movement. Thanks to the cancellation of the second mainspring barrel and the delicate parts arrangement, the movement can reduce the overall thickness without damaging any power reserve, and at the same time, it can transplant the elegant dial structure of LANGE 1 to large models. The dial of the GRAND LANGE 1 ‘Lumen’ shows the hours, minutes, seconds, large calendar and power reserve indicator, and the configuration is clear and non-overlapping.
Lange watch factory L095.2 movement

GRAND LANGE 1 ‘Lumen’ Model: 117.035

Movement: The L095.2 movement manufactured by Lange Watch Factory is manually wound, in accordance with Lange’s strictest quality standards, carefully modified and assembled by hand; five-way precision adjustment; both the machine plate and the bridge plate are untreated Made of German silver; hand-engraved balance wheel plywood
Movement parts: 400
Jewel Bearing: 42
Screwed gold sleeve: 7
Escapement system: pallet fork
Oscillator: shock-proof screw balance; watch factory-made top balance spring, 21,600 vibrations per hour, equipped with lateral fine-tuning screws and gooseneck-type precision fine-tuning system
Power reserve: 72 hours of full-winding operation
Functions: Display time in hours, minutes and small seconds with stop-seconds device; power reserve display; large calendar display
Operating components: crown for winding the watch and setting the time; buttons for quickly correcting the large calendar display
Case dimensions: diameter: 40.9 mm; thickness: 9.8 mm
Movement size: diameter: 34.1 mm; thickness: 4.7 mm
Crystal and case back: Sapphire crystal (hardness 9)
Case: Platinum
Dial: solid silver (black) main dial (outer ring, hours, minutes, small seconds), sapphire crystal with translucent coating on the groove part; large luminous calendar display and hours and power reserve
Hands: rhodium-plated gold; luminous hours, minutes, power reserve display
Strap: Hand-stitched black alligator leather strap
Clasp: Lange platinum pin buckle
Limited edition of 200 pieces