A. Lange & Sohne – LANGE 1 Tourbillon PERPETUAL CALENDAR

A. Lange & Söhne – LANGE 1 Tourbillon PERPETUAL CALENDAR White Gold NEW


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Thanks to a clear arrangement of the calendar display around the time indication, the LANGE 1 TOURBILLON PERPETUAL CALENDAR presents an abundance of information at a single glance. The latest model of this horological masterpiece is now presented in a discreet white-gold case with a grey dial.

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The LANGE 1 TOURBILLON PERPETUAL CALENDAR combines two classic complications with the iconic design of A. Lange & Söhne's most famous watch family. The calendar consists of a Lange outsize date, retrograde day-of-the-week and leap-year displays and a peripheral month ring. Due to the clear separation of the time and date, all information can be taken in at even a cursory glance. All of the perpetual calendar displays advance instantaneously. The mechanism is designed in such a way that it must be advanced only by one day in the year 2100. And the moon-phase display, located inside the subsidiary seconds dial, will even run true for 122.6 years before it needs to be corrected by one day.

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A subtle inscription beneath the twelve refers to the existence of the tourbillon. By looking through the sapphire-crystal caseback, it can be admired in all its technical complexity. The movement is equipped with Lange's patented stop-seconds mechanism. It brings the balance inside the tourbillon cage to a standstill instantly, gently and safely when the crown is pulled. This allows the watch to be set with one-second accuracy. The upper part of the tourbillon cage is decorated with black polish, the most sophisticated and time-consuming type of artisanal surface finishing. The bearing of the tourbillon cage features a diamond endstone as a tribute to the historic 1A pocket watches by A. Lange & Söhne.

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A solid central rotor with a 21-carat-gold segment in the middle and an additional platinum centrifugal mass on the periphery efficiently tension the mainspring of the self-winding calibre L082.1 movement so that the maximum power reserve of 50 hours is built up after just a short time on the wrist. Typical Lange quality hallmarks include the lavishly decorated movement with hand-engraved tourbillon and intermediate wheel cocks as well as screwed gold chatons.

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Technical Specifications

Model: LANGE 1 Tourbillon PERPETUAL CALENDAR Wwhite Gold

Reference №: 720.038

Movement
Lange manufacture calibre: L082.1
Number of movement parts / jewels: 624 / 76, including one diamond endstone
Screwed gold chatons: 6, including one diamond endstone
Escapement: Lever escapement
Oscillator:
Shock-resistant balance with eccentric poising weights,
balance spring manufactured in-house with a frequency of 21,600 semi-oscillations per hour
Power reserve: 50 hours when fully wound
Functions:
Off-centre time indication for hours and minutes; subsidiary-seconds dial;
tourbillon with patented stop-seconds mechanism; perpetual calendar
with outsize date, retrograde day-of-week display, peripheral month ring
and leap-year display; moon-phase display; day/night indicator
Case measures: Diameter: 41.9 millimetres; height: 12.2 millimetres
Movement measures:
Diameter: 34.1 millimetres; height: 7.8 millimetres
Case:  18-carat white gold
Dial: Solid silver, grey
Hands: Rhodiumed gold
Case versions: 
Pink gold, white gold
Strap
Hand-stitched alligator leather strap
Buckle: White-gold prong buckle

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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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FERDINAND BERTHOUD – The contribution made to horology

FERDINAND BERTHOUD – The contribution made to horology

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The contribution made by Ferdinand Berthoud
to horology

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His initial successes as a researcher and the awarding of the title of master by order of the King

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Obliged to work as a watchmaker’s companion for the masters of the Parisian guild, due to not having served his apprenticeship with one of them, the young Berthoud managed to overcome this hurdle by drawing attention to “his considerable application in perfecting the art of watchmaking”. He seized the opportunity of publishing his research at the French Royal Academy of Science by submitting the description of a new construction in a sealed envelope.

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The academics’ approval on April 26th 1752 of a longcase equation clock, considered highly ingenious, marked the beginning of his career as a researcher and at the same time, enabled him to stake his claim of official integration within the watchmaker community. On December 4th 1753, the King ordered that he be named a maître (master), a title that allowed him to open a workshop in the Rue de Harlay, near Place Dauphine.

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In 1754, the master once again submitted his inventions to the Academy. One was his first marine clock project. The others, examined and approved by the academics, were also equation systems: “a longcase equation clock with concentric seconds marking the months and days of the month, leap years, and which runs for 13 months without being wound”; as well as a watch with seconds and equation, marking the months and days.

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Even prior to being named a master, Ferdinand Berthoud indicated the direction he wanted his career to take – namely to devote himself to research and transmit his know-how through publications and teaching. This double vocation enabled him to rapidly make a name for himself in the scientific world of his time.

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Several articles in the Encyclopaedia published by Diderot were entrusted to him, and most particularly the article entitled “Equation”. In 1759, he published a successful treatise on popularization entitled, L’Art de conduire et de régler les pendules et les montres. A l’usage de ceux qui n’ont aucune connaissance d’horlogerie (The art of operating and adjusting clocks and watches.

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To be used by those with no knowledge of watchmaking). In 1763, his extensive treatise - L’Essai sur l’horlogerie ; dans lequel on traite de cet Art relativement à l’usage civil, à l’Astronomie et à la Navigation (An Essay on Horology; in which we deal with this Art in relation to its civil application, to Astronomy and to Navigation) was also well received.

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Affirmation of his vocation and official recognition of his work

1763 marked a turning point in Berthoud’s career, which was now bound up with the development of maritime navigation. The Academy of Science once again both witnessed and supported the horologist’s request for the opening of two reports, respectively deposited in 1760 and 1761. These described the N°1 maritime clock.

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Convinced by his skill, the academics obtained permission from the Minister of the Navy to send him to London to examine the Harrison marine clock. This opportunity demonstrated his worth and resulted in his nomination as a foreign member of the Royal Society on February 16th 1764.

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On August 29th of that year, Ferdinand Berthoud once again made a submission concerning the “construction of a marine watch…” This was the last time, as Berthoud was now sure of where he was going with his research and of having the option of seeking official support.

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Berthoud marine clock N°2, with motor spring and double pendulum wheel, 1763.

His projects were the subject of detailed requests punctuating his activities and in this context, he suggested the construction of two marine watches on May 7th 1766.
After successful experimentation with the N° 6 and 8 which are housed at the Musée des arts et métiers (Museum of Arts and Crafts), Ferdinand Berthoud was awarded a certificate entitled Brevet d’horloger Méchanicien du Roi et de la Marine ayant l’inspection de la construction des Horloges marines (Watchmaker and Mechanic to the King and Navy with construction inspection of marine clocks) created especially for him on April 1st 1770.

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FERDINAND BERTHOUD – Horloge de marine № 6 - 1777

From this time onwards, he abandoned the management of his workshop-boutique in favour of his research. He confirmed in 1792 that: “It is mainly since 1770 that I have been completely focused on this and I have in a way left the field of public work”.

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A tenacious investigator, a skilled and daring builder, and an inventor anxious to share his knowledge, Ferdinand Berthoud not only took part in improving horology; he also fostered the use of precision clocks in the sciences of his time, thus contributing to their progress.

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The title, privileges, and forms of recognition which punctuated his career, between the reign of Louis XV and the First Empire, as well as the tributes and studies which marked his critical fortune until the present day, reflect the importance of his position in the long quest for precision, from Huyghens’ discoveries right up to Guillaume.

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Biography FERDINAND BERTHOUD

 1727-1807

Horologist-mechanic by appointment to the King and the Navy

1727                              Ferdinand Berthoud is born on March 18 to a distinguished family of clockmakers at Plancemont in the Val-de-Travers, now in Switzerland’s canton of Neuchâtel.

1745                              At the age of 18, Ferdinand Berthoud settles in Paris to study clockmaking.

1753                              A decree of King Louis XV’s council awards the 26-year-old Ferdinand Berthoud the title of Master Clockmaker.

1755                              Ferdinand Berthoud writes a number of reference papers for the Encyclopédie méthodique edited by Diderot (1713-1784) and Alembert (1717-1783).

1763                              Publication of a two-volume horological treatise, Essai sur l’horlogerie…

1764                             Ferdinand Berthoud is elected to the Royal Society in London as an “associate overseas member” thanks to his masterpieces and his publications about watchmaking

1768                             The marine chronometers N° 6 and N° 8 were proved to be successful onboard the corvette “L’Isis” during a 18-month journey from Rochefort to Santo Domingo. The marine chronometer N°8 alloed to determine the real position on the map of the boat and calculate the longitude within half a degree thanks to astronomical observations.

1770                              After successful sea trials of the marine chronometers N° 6 and N° 8, Ferdinand Berthoud is commissioned as Horologist-mechanic to the King and the Navy, and receives a royal command for 20 marine chronometers for the French admiralty’s numerous charting expeditions and marine surveys of the late 18^th century.

1802                             Ferdinand Berthoud publishes a major work: Histoire de la mesure du temps par les horloges, a history of time measurement by clocks that demonstrates his immense knowledge of horological mechanics.

1804                             On July 17, Napoleon I makes Ferdinand Berthoud a Knight of the Legion of Honour as a member of the Institut de France. 

1807                             Ferdinand Berthoud publishes his last work, Supplément au Traité des montres à Longitudes…

                                      On June 20, 1807, Ferdinand Berthoud dies at the age of 80 in Groslay (France)

                                      His nephews, Pierre-Louis Berthoud (1754-1813) and Charles-Auguste Berthoud (1798-1876) successfully carry on the work of their uncle to earn renown as chronometer-makers. 

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Rue des Moulins 20
Case postale 128
2114 Fleurier, Val-de-Travers (NE)
Switzerland
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