Saturday, January 23, 2016

A. Lange & Sohne – DATOGRAPH Perpetual Tourbillon















A. Lange & Söhne SAXONIA DATOGRAPH Perpetual Tourbillon Limited Edition NEW

Chronograph with perpetual calendar and tourbillon

The latest masterpiece from Saxony pairs three complications with five supplementary functions. This unique timepiece by A. Lange & Söhne is not only technically impressive, but also stands out with a superbly organised face despite the density of information it displays.


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During the development of a multiple-complication timepiece, the most formidable challenge is to achieve the perfect interaction between different highly complex mechanisms and embedding them in a smoothly functioning ensemble. A. Lange & Söhne's DATOGRAPH PERPETUAL TOURBILLON is such a horological work of art.

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The black solid-silver dial of the new model contrasts beautifully against the 41.5-millimetre platinum case as well as the hands and hour markers in rhodiumed gold. It is limited to 100 watches. The name of the complicated watch subsumes its abundant timekeeping capabilities:

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DATOGRAPH

DATOGRAPH designates a column-wheel chronograph with a precisely jumping minute counter, a flyback function and the typical Lange outsize date. To master the challenge of precise short time measurements, the product developers relied on an ingenious feature that had already proven itself in the DATOGRAPH UP/DOWN. It distils three major technical advances in chronograph design into one: the column-wheel mechanism assures that all chronograph functions are reliably controlled. The jumping minute counter crisply displays the stopped times. And the flyback function allows the duration of consecutive events to be measured with extremely short reaction times.

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PERPETUAL

PERPETUAL, the middle element of the name, refers to a instantaneously jumping perpetual calendar with a moon-phase display. All indications of the perpetual calendar – including the outsize date as well as the day-of-week, month and leap-year displays in subsidiary dials – switch instantaneously and thus provide unambiguous readings at all times. A first correction of the mechanism by one day can wait until the first day of March in the secular year 2100.

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And because of its stunning mechanical precision, the moon-phase display will only deviate from the true lunation by a single day after 122.6 years. Three correctors allow the separate adjustment of the moon-phase display, the day of the week and the combined advance of the month and leap-year indications. After a standstill of merely a few days, the rapid-correction pusher at ten o'clock can be used to conveniently update all displays at the same time.

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TOURBILLON

The fascinating tourbillon mechanism is exposed by the sapphire-crystal caseback and the open tourbillon bridge. There, the escapement rotates about its own axis once a minute inside the filigreed cage. This rotary motion offsets the influence of gravity on the balance wheel with eccentric poising weights. In conjunction with the free-sprung balance spring crafted in-house, it assures excellent rate accuracy across the entire 50-hour power reserve.

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The power-reserve indicator integrated at the end of the tachymeter scale reminds the owner when it is time to rewind the watch. For the first time in a Lange tourbillon with chronograph, the balance beats at a rate of 18,000 instead of the conventional 21,600 semi-oscillations per hour. This corresponds to a frequency of 2.5 hertz. Consequently, stopped times can be displayed with an accuracy of one-fifth of a second. The patented stop-seconds mechanism instantaneously brings the balance wheel inside the tourbillon cage to a standstill when the crown is pulled. This allows the watch to be set with one-second accuracy.

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Never stand still


In addition to the development of the 729-part calibre L952.2 movement, the finissage and assembly processes challenged the expertise of the manufactory. Only the most talented watchmakers can overcome the numerous obstacles encountered en route to the flawless interaction of the individual modules. The path to success requires extensive experience, dexterity, concentration and patience. Thus, the DATOGRAPH PERPETUAL TOURBILLON is yet another manifestation of A. Lange & Söhne's determination to never stand still and to test the limits of mechanical horology.

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Technical Specifications

Model: Saxonia DATOGRAPH Perpetual Tourbillon Platinum

Reference №: 740.036

Limited edition100 watches.

Movement 
Lange manufacture calibre L952.2;
Manually wound, 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; balance cock engraved by hand
Movement measures
Diameter: 32.6 millimetres; height: 9.0 millimetres
Movement parts: 729
Bearing jewels: 59
Screwed gold chatons : 5, including one diamond endstone
Escapement: Lever escapement
Oscillator: 
Shock-resistant balance with eccentric poising weights, balance spring
manufactured in-house with a frequency of 18,000 semi-oscillations per hour
Power reserve: 50 hours when fully wound
Functions
Hours and minutes; subsidiary seconds dial;
Tourbillon with patented stop-seconds;
Chronograph with flyback and precisely jumping minute counter;
Perpetual calendar with outsize date, day of week, month and leap-year display;
Moon-phase display; day/night indicator;
Power-reserve indicator; 50 hours power reserve
Operating elements 
Crown for winding the watch and setting the time, two pushers for operating the chronograph, rapid-correction pusher for collectively advancing all calendar displays, one recessed corrector each for adjusting the day of the week, the month and the moon phases
Case 
Platinum
Diameter: 41.5 millimetres; height: 14.6 millimetres
Crystal and back: Sapphire crystal (Mohs hardness 9)
Dial 
Black 
Hands: 
Hour and minute hands in rhodiumed gold, luminous; day, month and four-year hands in rhodiumed gold; chronograph sweep seconds hand, subsidiary seconds hand and minute counter hand in  rhodiumed gold
Strap 
Hand-stitched alligator leather strap, black
Buckle: 
Lange 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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