A. Lange & Söhne (Lange) GRAND LANGE 1 ‘Lumen’ Limited Edition showcases Lange’s new idea: the translucent dial reveals the first luminous large calendar display device.
A. Lange & Söhne (Lange) New Product Awards 2013
Still legible in the dark: GRAND LANGE 1 ‘Lumen’
When Lange first introduced the big 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 indicated by the watch 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 shows 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 made by Ferdinand A. Lange 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.
Lange watch factory L095.2 movement
The double-assembled watch factory’s self-made L095.2-type movement combines superb craftsmanship and high-level aesthetics, and can also be admired from the other side through the sapphire crystal back cover. Needless to say, GRAND LANGE 1 ‘Lumen’ is impeccable from every angle.
Only a year ago, Lange gave the 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’ presents the hours, minutes, seconds, large calendar and power reserve indicator, and the configuration is clear and non-overlapping.