Complex mechanics, elegant personality
The LANGE 1 TOURBILLON PERPETUAL CALENDAR “Lumen” merges traditional watchmaking artistry with contemporary design. The semi-transparent dial provides insights into the elaborate calendar mechanism: the fascinating mechanics can be observed even in the dark, thanks to the delicate nuances of luminosity.
The constructive complexity is also exhibited in the newly developed self-winding movement L225.1 that combines the eponymous complications with functional particularities such as the stop-seconds mechanism for the tourbillon and the typical Lange outsize date. Lavish decorations address the superior standards regarding artisanal finish.
Limited to 50 pieces and exclusively available in platinum, the timepiece will be launched at Watches and Wonders 2026 in Geneva.
Unmistakeable – by day and by night
In a refined manner, the LANGE 1 TOURBILLON PERPETUAL CALENDAR “Lumen” incorporates a tourbillon and a perpetual calendar into the unmistakeable design of the LANGE 1, whose off-centre dial configuration is prominent yet at the same time harmonious. The geometrically well-balanced arrangement of the displays follows classic rules such as the golden ratio and axial design.
Apart from its remarkable dial geometry, the design language hinges on two additional principles: contrast and transparency. Hence, the light-coloured platinum case counterbalances the dark dial and the black alligator leather strap. On the dial, hands and appliques in rhodiumed gold and white scales against a dark background assure superb legibility. The semi-transparent dial endows the watch with a contemporary facet. It is also the prerequisite for the “Lumen” function and simultaneously unveils the beauty of Lange watchmaking artistry.
Luminescence – new elegance
All displays of the LANGE 1 TOURBILLON PERPETUAL CALENDAR “Lumen” are luminous and therefore also provide unambiguous readings in the dark. The meticulously orchestrated interplay of larger and more filigreed luminous surfaces creates an elegant, nuanced ambience of light. The implementation of each individual “Lumen” display is based on an innovative, complex dial architecture.
The highlights include the luminous moon-phase display with an integrated day/night indication and the outsize date mechanism that is visible in the dark. The luminescence of the hands for the hours, minutes, seconds, day of the week as well as all the scales and appliques is more subtle.
Perpetual calendar – a different approach
With the LANGE 1 TOURBILLON PERPETUAL CALENDAR launched in 2012, A. Lange & Söhne struck a new path in their approach to integrating the perpetual calendar while preserving the dial layout of the LANGE 1 with its off-centre displays: the months are indicated with a peripheral ring that switches at the end of the month. The display is complemented with the prominent outsize date and a retrograde day-of-week display on the left side of the dial. The leap year appears in a small aperture at 6 o’clock.
All calendar indications switch instantaneously to produce unambiguous readings at all times. They can be advanced jointly or separately with correctors on the flank of the case if required. Assuming the watch runs without interruption, a manual correction is needed for the first time on 1 March in 2100, a secular year.
Moon phase – precise and richly detailed
The first luminous moon-phase display with an integrated day/night indication premieres in the LANGE 1 TOURBILLON PERPETUAL CALENDAR “Lumen”. To ensure that the display is also legible in the dark, the Lange engineers developed a mechanism that extends across several levels.
A celestial disc that rotates clockwise once during 24 hours forms the backdrop for the lunar orbit. During the day, a light sky without stars can be perceived ‒ at night, a dark sky studded with a multitude of luminous stars. In front of the celestial disc, the earth’s companion can be observed while it slowly traverses the sky. On its reverse side, it is coated with a luminous compound that makes its contours glow alluringly. The display deviates from the true position of the moon by only one day after 122.6 years.
Tourbillon – beyond precision
On the dial side, only a subtle inscription at 12 o’clock offers a clue as to which grand complication lies concealed within the LANGE 1 TOURBILLON PERPETUAL CALENDAR “Lumen”: the tourbillon. Only at a glance through the sapphire-crystal caseback, the ingenious mechanism is revealed in all its technical splendour. Once a minute, the filigreed carriage rotates about its own axis, thus compensating for the influence of gravity on the balance with eccentric poising weights.
The stop-seconds device allows to immediately halt the balance within the tourbillon cage at will by pulling the crown. This makes it possible to set a tourbillon watch with one-second accuracy, thanks to a sophisticated construction with a V-shaped arresting spring for which the manufacture was granted a patent in 2008.
The artisanal virtuosity manifests itself especially in the tourbillon cage as well as the tourbillon cock and the intermediate-wheel cock. They are crafted from stainless steel and exhibit one of the most elaborate finishing techniques: black polish. Furthermore, both cocks are embellished with small stars and a shooting star. They are engraved by hand and then circumspectly polished, creating a richly contrasting transition between the matted surroundings and the gleaming engravings.
The bearing of the tourbillon is crowned with a diamond endstone. It pays homage to the highest quality level of A. Lange & Söhne pocket watches ‒ the 1A-quality ‒ and represents the lustrous finishing touch to this precision mechanical masterpiece.
Movement L225.1
Down to the last detail, the new self-winding manufacture calibre L225.1 was developed in accordance with the highest standards to which A. Lange & Söhne is committed. Its constructive complexity makes it possible to unite a tourbillon, perpetual calendar and a moon-phase display – and to furthermore equip the watch with functional particularities such as a stop-seconds device and the outsize date. The refined composition of lavish decorations emphasises the manufacture’s quest for perfection.
A central rotor, crafted from 18-carat white gold (750), bears the A. Lange & Söhne signature and assures efficient winding. The external centrifugal mass in 950 platinum provides additional momentum, making a maximum power reserve of 50 hours available after only a short time on the wrist. The rotor also adopts the design principle of colour contrast of this timepiece, implemented in the dark, black-rhodiumed central segment and the lighter surface of the centrifugal mass.
The 77th Lange calibre developed after the re-establishment of the manufacture in 1990 features a balance with eccentric poising weights and a freely oscillating balance spring crafted in-house. The going train operates at a frequency of 21.600 semi-oscillations per hour.
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