Reading Time: 4 minutes

With the off-centre displays and peripheral month ring, the A Lange & Söhne LANGE 1 PERPETUAL CALENDAR endows a sophisticated complication with a unique face. Launched in April 2021, the white-gold model version with a solid pink-gold dial, limited to 150 pieces, and the pink-gold version featuring a grey solid-silver dial, are now joined by a platinum model with a black dial. The dark background effectively highlights the moon-phase display with its integrated day/night indicator.


Centred exclusively on its eponymous complication, the A Lange & Söhne LANGE 1 PERPETUAL CALENDAR introduced two years ago, represents the highest standards in precision, design and originality, resulting in a singular appeal. The new model version, housed in a 950-platinum case and measuring 41.9 mm in diameter, is complemented with a black dial, thus enriching the watch family with a particularly refined colour combination. The month ring provides the framework for all the displays. The numerals of the outsize date and the leap year contrast well against the black background. All calendar indications switch instantaneously and, therefore, produce unambiguous readings at any given time. They can be advanced collectively or separately with correctors. Once set correctly, the mechanism is programmed to accurately display the turn of the month until 2100. 


A perpetual calendar watch the Lange way 

Designing a mechanism for a perpetual calendar that takes into account the different durations of the months in a year as well as the leap years, presents a challenge that the ambitious A. Lange & Söhne developers took on in 2001 with the LANGEMATIK PERPETUAL. Their objectives: seeking innovative technical solutions while assuring optimum legibility. In order to preserve the signature design of the LANGE 1 watch family with its off-centre and non-overlapping displays, Langeʼs watchmakers opted for a completely new approach and developed a peripheral month ring that advances instantaneously at the end of each month. Premiered in 2012 with the launch of the LANGE 1 TOURBILLON PERPETUAL CALENDAR, the innovative mechanism replaces the traditional design where a 48-step cam controls the month display. 


Balanced design and function 

The commitment to tailor the complex mechanical requirements to the characteristic design of the LANGE 1 presented our developers with constructive challenges, as the large peripheral ring has to be advanced instantaneously by 30 degrees from one month to the next. Throughout the month, energy is collected via a cam in order to provide the required power exactly on time, at midnight on the last day of the month,” explains Anthony de Haas, Director of Product Development. “Thanks to this design feature in the LANGE 1 PERPETUAL CALENDAR, the watch familyʼs distinctive face is maintained. The timepiece is therefore also emblematic of our philosophy to continuously break new ground in the realm of precision watchmaking.” 


Precise moon phase 

Adding a day/night indicator to the moon-phase display is also typical of the manufactureʼs continued quest for precision. Constructed across two levels, it consists of a solid-gold celestial disc with graduated blue hues that rotates around its own axis once during 24 hours. Against this backdrop, the white-gold moon performs its synodic orbit in 29 days, 12 hours, 44 minutes and 3 seconds ‒ with such precision that the display only needs to be corrected by one day after 122.6 years. First implemented in the LANGE 1 MOON PHASE in 2016, the indication depicts the earth’s companion moving across a bright-blue sky during the day and a dark-blue starry sky at night, thus indicating the diurnal and nocturnal hours respectively. 

A Lange & Söhne LANGE 1 PERPETUAL CALENDAR calibre L021.3

The high standards of artisanal perfection upheld by the Saxon manufacture immediately become apparent at a glance through the sapphire-crystal caseback of calibre L021.3 ‒ it is elaborately finished by hand and assembled twice. The technical features of the manufacture movement include a unidirectional winding rotor in 21-carat gold with a centrifugal mass in 950 platinum, a power reserve of 50 hours and a balance with eccentric poising weights that beats at a frequency of 21,600 semi-oscillations per hour. Lange-typical quality hallmarks such as plates and bridges made of untreated German silver decorated with Glashütte ribbing, five gold chatons held by blued-steel screws as well as the balance cock engraved free-hand, with the whiplash spring mounted above to regulate beat adjustments reflect the manufactureʼs lofty aspirations in every single detail. 

A Lange & Söhne LANGE 1 PERPETUAL CALENDAR Technical Specifications

Reference 345.036E


  • Time indicated in hours, minutes and subsidiary seconds dial;
  • Perpetual calendar with instantaneously advancing displays for outsize date, day of week, month and leap year;
  • Moon-phase display with integrated day/night indicator


  • Lange manufacture calibre L021.3, self-winding, 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; unidirectional winding rotor in 21-carat gold with centrifugal mass in 950 platinum; balance cock engraved by hand
  • No. of movement parts: 621
  • No. of jewels: 63
  • No. of screwed gold chatons: 5
  • Escapement: Lever escapement
  • Oscillator: Shock-resistant balance with eccentric posing weights; balance spring manufactured in-house, frequency of 21,600 semi oscillations per hour; precision beat adjustment mechanism with lateral setscrew and whiplash spring
  • Power reserve: 50 hours when fully wound
  • Diameter: 35.8 millimetres; height: 8.8 millimetres

Case & Dial

  • 950 platinum
  • Diameter: 41.9 millimetres; height: 12.1 millimetres
  • Crystal and transparent caseback: Sapphire crystal (Mohs hardness 9)
  • Dial: Solid silver, black
  • Hands: Rhodium gold

Strap & Buckle

  • Hand-stitched leather, black
  • Prong buckle in 950 platinum

About A. Lange & Söhne
Dresden watchmaker Ferdinand Adolph Lange laid the foundations for Saxony’s precision watchmaking industry when he established his manufacture in 1845. His precious pocket watches remain highly coveted among collectors all over the world. The company was expropriated after the Second World War, and the name A. Lange & Söhne nearly vanished. But in 1990, Walter Lange, Ferdinand Adolph Lange’s great-grandson, had the courage to relaunch the brand. Today, Lange crafts only a few thousand wristwatches per year, mainly in gold or platinum. They are equipped exclusively with movements made in-house that are elaborately finished and assembled by hand. With 71 calibres manufactured in-house since 1990, A. Lange & Söhne holds a leading position in the watchmaking world. Its greatest successes include brand icons such as the LANGE 1, the first regularly produced wristwatch with an outsize date, and the ZEITWERK, with its precisely jumping numerals. Extraordinary complications such as the ZEITWERK MINUTE REPEATER, the DATOGRAPH PERPETUAL TOURBILLON or the TRIPLE SPLIT represent the manufacture’s quest to take its traditional art to increasingly new heights. Launched in 2019, the sporty and elegant ODYSSEUS in stainlesssteel marks the beginning of a new chapter for the manufacture.

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