A. Lange & Söhne 1815 Rattrapante


A. Lange & Söhne 1815 Rattrapante

1815 Rattrapante

Short-time measurements, technically superb
La Cote des Montres - July 21st, 2022

A. Lange & Söhne is enriching its 1815 model family with a timepiece featuring one of the most sophisticated horological complications: The chronograph rattrapante. The new model is fully focused on the eponymous complication, and it is endowed with a custom- developed movement. It not only delivers the foundation for a totally unique dial design but also stands for the drive that allows the Saxon manufactory to go its own way. The 1815 Rattrapante has a platinum case and comes in a limited edition of 200 pieces.


The masterclass
of short-time measurement


With the 1815 Rattrapante, A. Lange & Söhne’s watchmakers yet again demonstrate their expertise in the field of short-time measurement. Its complex mechanism expands the functionality of a classic chronograph by allowing the measurement of a random number of lap times within a minute. For this purpose, the watch has two superposed chronograph hands, the centre chronograph hand and the centre rattrapante hand. Both hands start together when the pusher at 2 o’clock is actuated. The centre rattrapante hand can now be stopped independently of the centre chronograph hand and then resynchronised with it. This procedure, used for instance to measure lap times, can be repeated infinitely.


Functional elegance


The 1815 Rattrapante comes in a noble platinum case. The bright argenté-coloured dial and the dark blued hands contrast well and assure perfect legibility. The traditional style elements of the watch include the peripheral railway-track minute scale and the prominent Arabic numerals. They clearly reflect the genre that already characterised the historic Lange pocket watches and the model family that is still named after Ferdinand Adolph Lange’s birth

The development of their own movement makes it possible for the watchmakers to freely choose the positions of the subsidiary dials. Instead of the ordinary positions at 3 and 9 o’clock, the 30-minute counter and the subsidiary seconds dial are at 12 and 6 o’clock, respectively, on the vertical centre axis. This symmetric arrangement gives the 1815 Rattrapante a balanced and expressive personality. Additionally, the peripheral tachometer scale allows average speeds to be determined.


Manufacture calibre L101.2


The 1815 Rattrapante is powered by the manufacture movement L101.2. The entire rattrapante chronograph mechanism is configured such that it is visible through the sapphire-crystal caseback. This allows the complex switching processes to be observed in detail. The control of elapsed and lap-time measurements is handled highly precisely in the classic manner with two column wheels. When fully wound, the mainspring barrel delivers a power reserve of 58 hours. In connection with the screw balance, also manufactured in-house, the freely oscillating Lange balance spring guarantees excellent rate accuracy at a frequency of 21,600 semi-oscillations per hour (3 hertz).

It is already the seventh calibre with this complication developed and crafted by Lange. With a special finissage, the movement was already integrated in the 1815 Rattrapante Honeygold “Homage to F. A. Lange”. With this 100-watch limited edition featuring Lange’s exclusive honey-gold alloy, the manufactory celebrated the 175th anniversary of Saxon precision watchmaking in 2020.


The signature
of the grand masters


The finissage of the calibre, that was manually assembled twice, reflects the tradition of Ferdinand Adolph Lange: His movements always stood out with prominent design elements as well as inimitable aesthetic details. As befits the 1A quality attribute – the highest quality category of his pocket watches – the calibre L101.2 movement features bridges and cocks made of untreated German silver, a screw balance, screwed gold chatons that secure the jewels and a hand-engraved balance cock. Paired with the latest-generation watchmaking skills, these traditional elements unite to form a micromechanical fusion of the arts.

All upper sides of the moving parts of the rattrapante chronograph, such as levers, springs and jumpers, are decorated with straight graining while the peripheral chamfers are polished. Bevel-polishing re-entrant angles is a particular challenge for the finishing specialists. Only experienced artisans will succeed in polishing the corners acutely and so they are truly sharp.


A class of its own


The conceptualisation and production of top-flight chronographs, especially of split-seconds chronographs, is regarded as one of the most difficult challenges in precision watchmaking. It takes considerable skill, experience and patience to assure the precision and reliability of the
complex mechanism.

Depuis la reprise des activités de A. Lange & Söhne, quelques garde-temps ont établi de nouvelles normes en la matière. Avec le Double Split, en 2004, A. Lange & Söhne réalise le premier chronographe à double rattrapante de l’histoire de la haute horlogerie, qui a allongé la durée des mesures des intervalles de temps de 60 secondes à 30 minutes. À ce jour, le Triple Split présenté en 2018 a porté le développement de la fonction rattrapante à son plus haut niveau. Complétées par une troisième paire d’aiguilles que l’on peut arrêter indépendamment, les fonctions chronographe et rattrapante peuvent désormais fonctionner pendant une durée de douze heures.

Since the relaunch of A. Lange & Söhne, several timepieces defined new standards in this field. In 2004, for the first time in the history of precision watchmaking, A. Lange & Söhne created a double rattrapante chronograph that extended the range of intermediate time measurements from 60 seconds to 30 minutes: the Double Split. Presented in 2018, the Triple Split benchmarked the current state of the art in rattrapante function developments. With the addition of a third, separately stoppable hand pair, the chronograph and rattrapante functions can be used for measurements that last up to 12 hours. To this very day, both timepieces are unique in precision watchmaking. Now, the new 1815 Rattrapante comes into the focus as a classic interpretation of the split-seconds mechanism, indeed as a singular complication. It makes its appearance in a platinum case with a diameter of 41.2 millimetres. Lange’s engineers succeeded in limiting the height of the case to 12.6 millimetres despite the technical complexity of its 365-part manually wound calibre. Given its horological intricacy, this masterpiece is limited to a global 200-piece edition.


A. Lange & Söhne


Dresden watchmaker Ferdinand Adolph Lange laid the cornerstone of Saxony’s precision watchmaking industry when he established his manufactory in 1845. His precious pocket watches remain highly coveted among collectors all over the world. The company was expropriated after World War II, and the name A. Lange & Söhne nearly vanished. In 1990, Ferdinand Adolph Lange’s great-grandson Walter Lange had the courage to relaunch the brand.

Today, Lange crafts only a few thousand wristwatches per year, predominantly in gold or platinum. They are endowed exclusively with proprietary movements that are lavishly decorated by hand and assembled twice. With 66 manufacture calibres developed since 1990, A. Lange & Söhne has secured a top-tier position in the world of watchmaking. Brand icons such as the Lange 1 with the first outsize date in a regularly produced wristwatch, and the Zeitwerk with its precisely jumping numerals display, rank among the company’s greatest successes.

Exceptional complications such as the Zeitwerk Minute Repeater, the Triple Split, and the so far most complicated model, the Grand Complication presented in 2013 in a six-watch limited edition, reflect the manufactory’s determination to achieve ever new pinnacles in its tradition-steeped horological artistry. Launched in 2019, the sporty-elegant Odysseus marks the beginning of a new chapter for A. Lange & Söhne.

A. Lange & Söhne
1815 Rattrapante

Technical description

Reference :425.025
Limited edition :200 watches, edition engraving, boutique exclusivity
Movement :Lange manufacture calibre L101.2
Manually wound
Crafted to the most exacting Lange quality standards
Decorated and assembled by hand
Precision-adjusted in five positions
Plates made of untreated German silver
Balance cock and chronograph bridge engraved by hand
Diameter :32.6 millimetres
Height :7.4 millimètres
Components :365
Jewels :36
Screwed gold chatons :4
Escapement :Lever escapement
Oscillation system :Shock-resistant screw balance
Balance spring crafted in-house
Frequency 21,600 semi-oscillations per hour
Precision beat adjustment system with lateral setscrew and whiplash spring
Power reserve :58 hours when fully wound
Functions :Time display with hours and minutes as well as subsidiary seconds with stop seconds
Rattrapante chronograph with 30-minute counter
Tachometer scale
Operating elements :Crown for winding the watch and setting the time
Two chronograph pushers
One pusher to operate the rattrapante mechanism
Crystal and caseback :Sapphire crystal (Mohs hardness 9)
Case :950 platinum
Diameter :41.2 millimetres
Height :12.6 millimetres
Dial :Solid silver, argenté
Hands :Hours, minutes, and subsidiary seconds: blued steel
30-minute counter: blued steel
Centre chronograph hand: rhodiumed steel
Centre rattrapante hand: blued steel
Bracelet :Hand-stitched alligator leather, black
Clasp :Prong buckle in 950 platinum