A. Lange & Sohne – 1815 RATTRAPANTE Perpetual Calendar White Gold Edition 2023
Threefold complication, twofold assembly, one-of-a-kind Lange
With the 1815 RATTRAPANTE PERPETUAL CALENDAR, A. Lange & Söhne presents three of the most sophisticated watchmaking complications in a classic design. The equally rare and ambitious combination of a split-seconds or rattrapante chronograph with a perpetual calendar now appears in a new guise, featuring an 18-carat white gold case with a pink-gold dial. The new 1815 RATTRAPANTE PERPETUAL CALENDAR is limited to 100 pieces.
Click, to see the large size. ▶ BIG FOTO 
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The outstanding timepiece excels in the measurement of short and long distances: thanks to its eponymous complications, the 1815 RATTRAPANTE PERPETUAL CALENDAR sets standards in both short-time measurement and the display of calendar periods.
Comparative time measurements to a fraction of a second
The rattrapante function of the 1815 RATTRAPANTE PERPETUAL CALENDAR represents one of the greatest horological challenges. In addition to the conventional functions of a chronograph, this sophisticated complication is capable of measuring intermediate times and comparative times, as well as determining minimum and maximum values in the course of one minute.
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Since the balance wheel of the manufacture calibre L101.1 beats with six semi-oscillations per second, the stopped times can be recorded with an accuracy of one sixth of a second. High-precision readings are assured thanks to the additional graduation on the peripheral minute scale.
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The precisely orchestrated proceedings within the movement can be observed through the sapphire-crystal caseback. The classic two-column wheel transmission is used to control the measurement of stopped and intermediate times. As is typical for A. Lange & Söhne, technical intricacy is coupled with a high degree of artisanship. The upper surfaces of all moving parts are decorated with straight graining while the peripheral chamfers are polished. Only an experienced finisseur has the skill to polish the bevels to sharp and flat perfection.
A calendar for perpetuity
While the rattrapante chronograph is capable of measuring different time intervals to a fraction of a second, the remarkable technical feat of the perpetual calendar lies in its “long-term memory”. As its name suggests, the complex and prescient mechanism ensures that the date, day of the week and month are correctly displayed ‒ every single day, during decades, even taking leap years into account. The calendar indications must only be corrected by one day but not until 1 March 2100; according to the rules of the Gregorian calendar, the leap year will then be skipped.
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The high-precision moon-phase display has also been programmed with the long term in mind. It so closely emulates the duration of the synodic orbit of the earth’s satellite that it would take 122.6 years for the display to be corrected by one day.
Harmoniously arranged displays
Not only the technical details distinguish the 1815 RATTRAPANTE PERPETUAL CALENDAR but also the well-organised arrangement of its displays. Following the DATOGRAPH PERPETUAL TOURBILLON (2019) and the LANGE 1 PERPETUAL CALENDAR (2021), it is the third A. Lange & Söhne timepiece showcasing an 18-carat pink gold dial: the warm, golden hue contrasts elegantly with the cool white gold of the case.
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With a traditional railway-track minute scale, Arabic numerals and the harmonious arrangement of the four subsidiary dials, the dial embodies the essence of the watch family named after the birth year of Ferdinand Adolph Lange.
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The manifold displays of the perpetual calendar and the rattrapante chronograph echo the classic aesthetics of earlier Lange pocket watches. The two pairs of combined calendar indications are arranged at 3 and 9 o’clock. The left subsidiary dial shows the date and day of the week, the right the month and leap year. Sharing an auxiliary dial with the subsidiary seconds at 6 o’clock, the moon-phase display provides an expressive colourful accent. The minute counter and power-reserve indicator are located at 12 o’clock.
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The shorter gold hand in the inner circle reveals when it is time to deliver new power to the movement via the winding crown. The longer hand made of blued steel imparts information about the stopped minutes.
Manufacture calibre L101.1
Incorporating traditional design and engineering features, the manually wound movement L101.1 totals an impressive number of 631 individual parts. The mechanism of the perpetual calendar alone requires 211 components, a further 206 account for the rattrapante-chronograph mechanism.
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A screw balance, which is driven by the balance spring developed and manufactured in-house, ensures high rate stability. Lange-typical quality hallmarks such as screwed gold chatons, blued screws, an elaborate whiplash precision index adjuster and the hand-engraved balance cock are visible through the sapphire-crystal caseback. The finissage of the movement, which is assembled twice, reflects A. Lange & Söhne’s high standards in every single detail.
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“With three classic complications, the manufacture calibre L101.1 is one of our most complex movements. Each one in itself already constitutes a technical feat; when combined, they represent a far greater challenge. For our designers and our watchmakers in equal measure, since the tweaking and tuning process of all mechanisms requires an exceptionally high degree of dexterity and technical expertise,” explains Anthony de Haas, Director of Product Development at A. Lange & Söhne.
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Technical Specifications
Model: 1815 RATTRAPANTE Perpetual Calendar Handwerkskunst White Gold Edition
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Reference №: A421.056FE
Movement
Lange manufacture calibre L101.1;
Manually wound, crafted to the most exacting Lange quality standards,
Diameter: 32.6 millimetres; height: 9.1 millimetres
Movement parts: 631
Jewels: 43
Screwed gold chatons: 4
Escapement: Lever escapement
Power reserve: 42 hours when fully wound
Oscillator:Shock-resistant screw balance, superior-quality balance spring manufactured in-house, frequency of 21,600 semi-oscillations per hour, precision beat adjustment mechanism with lateral setscrew and whiplash spring
Functions
Time indicated in hours, minutes and subsidiary seconds dial with stop seconds; rattrapante chronograph with minute counter; per
Operating elements Crown for winding the watch and setting the time; two chronograph buttons,
one button to operate the rattrapante mechanism; separate recessed correctors for advancing the
date, day of week, month and moon phasepetual calendar with date, day of week, month, moon phase and leap year; power-reserve indicator
Case
18-carat White Gold
Hinged cuvette in blue enamelled white gold with relief and tremblage engraving
Diameter: 41.9 millimetres; height: 14.7 millimetres
Crystal and back: Sapphire crystal (Mohs hardness 9)
Dial
Solid pink gold
Hands and appliques: Rhodiumed gold; blued steel hour, minute, minute counter and
rattrapante hand, rhodiumed steel chronograph hand
Strap
Hand-stitched alligator leather, dark brown
Buckle: Deployant buckle in 18-carat white gold
Limited Edition to only 100 pieces
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Press Release - 2023
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Contact information for the media
Arnd Einhorn, Director Press and PR
* Tel.: +49 (0)35053 44 5505
E-mail: presse@lange-soehne.com
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