A. Lange & Söhne Langematik Perpetual, White-Gold Case and Black Dial (Ref. 310.026)

The LANGEMATIK PERPETUAL was created for people who expect technical progress to make life more convenient. Now, Lange’s first self-winding wristwatch with a perpetual calendar and an outsize date is being presented in a new version featuring the white-gold case and a black dial.

The LANGEMATIK PERPETUAL was the world’s first wristwatch with a self-winding movement to incorporate a perpetual calendar with an outsize date. The perpetual calendar displays the date, the day of the week, and the month; it recognises the different number of days in each month and even the leap years. Once correctly set, the date display needs only to be corrected by one day every hundred years.

The moon-phase display is a paragon of precision as well. It deviates from the true position of the moon by merely one day every 122.6 years, assuming the watch runs without interruption. To make it as user-friendly as possible, the calendar displays can be advanced collectively or individually.

The LANGEMATIK PERPETUAL owes its prominent appearance to the elegant white-gold case combined with a black, solid-silver dial that delivers an abundance of information at a single glance. The luminous hands and the rhodiumed-gold appliques clearly stand out against the dark background. A black crocodile strap and a white-gold prong buckle take the theme of vivid contrasts a step further.

The heart of the LANGEMATIK PERPETUAL is the proven self-winding Sax-0-Mat calibre with the patented Zero-Reset mechanism. When the crown is pulled, the seconds hand jumps to the zero position, thus simplifying the synchronisation of the watch. The bidirectionally winding rotor in 21-carat gold with a platinum centrifugal mass builds up the maximum power reserve of 46 hours after only a short time on the wrist.

Numerous details of the meticulously finished movement can be admired through the sapphire-crystal caseback. It reveals the three-quarter plate made of untreated German silver, the classic screw balance, and the hand-engraved balance cock with the whiplash precision index adjuster.

The exclusive timepiece will be presented for the first time on 23 September 2014, when the first Lange boutique in Moscow is inaugurated.

Technical details
Model: LANGEMATIK PERPETUAL (Ref. 310.026)

Movement 
Lange manufacture calibre L922.1 SAX-0-MAT, self-winding, crafted to the most exacting Lange quality standards, decorated and assembled by hand; precision-adjusted in five positions; three quarter plate made of untreated German silver with integrated three-quarter rotor in 21-carat gold and centrifugal mass in platinum, reversing and reduction gear with four ball bearings; balance cock engraved by hand
Movement parts: 478
Jewels: 43
Escapement: Lever escapement
Oscillator: Shock-resistant screw balance, Nivarox ® balance spring, frequency of 21,600 semi oscillations per hour, whiplash precision index adjuster with patented beat-adjustment mechanism
Power reserve: 46 hours when fully wound

Movement dimensions 
Diameter: 30.4 millimetres; height: 5.7 millimetres

Functions 
Time display with hours and minutes, subsidiary seconds with stop seconds and patented ZERO-RESET function; perpetual calendar with date, day of the week, month, moon phase and leap year; day/night indicator

Operating elements 
Crown for winding the watch and setting the time; a recessed main push piece for simultaneously advancing all calendar displays; recessed corrector buttons for individually advancing the day, the month, and the moon phase

Case
Diameter: 38.5 millimetres
White gold
Height: 10.2 millimetres
Crystal and back Sapphire crystal (Mohs hardness 9)

Dial
Solid silver, black
Hands and appliqués: Rhodiumed gold, luminous

Strap
Hand-stitched crocodile strap, black
Clasp: Lange prong buckle in white gold

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