The ingenious combination of a flyback chronograph and a perpetual calendar is now available in an elegant white gold case with a perfectly matching grey dial.
Press release
Capturing not only the moments but also short and long eternities is a challenge that the Datograph Perpetual has successfully mastered ever since its launch three years ago. As a specialist in short-time measurements it showcases the obligatory features of a Lange chronograph: the flyback function, the precisely jumping minute counter and the classic column wheel mechanism.
Its perpetual calendar mechanism requires no correction until 2100, a secular year according to the Gregorian calendar. Thus, on 28 February 2100, all displays can be collectively advanced by one day to skip the 29th with pushbutton ease. Apart from the day of the week, the month, the four-year cycle with leap years, and the moon phase, the new Lange watch also indicates the day/night rhythm. Because of the extreme precision of the mechanism, the moon phase deviates from the true lunar cycle by only one day every 122 years.
The calendar indications cannot only be corrected individually with recessed push pieces; the Datograph Perpetual also has a convenient universal corrector that allows all calendar displays, including the date, to be collectively advanced in steps of one day. To prevent this from happening inadvertently, the crown must be pulled first, for example in the event that the watch has stood still for some time.
The complex movement of the Datograph Perpetual consists of 556 parts, most of which are meticulously finished by hand.
Data sheet Datograph Perpetual
Movement
Lange manufacture calibre L952.1, manually wound, crafted to the highest Lange quality standards and largely assembled and finished by hand; precision-adjusted in five positions; plates and bridges made of untreated German silver; balance cock engraved by hand.
Number of parts: 556
Jewels: 45
Screwed gold chatons: 4
Escapement: Lever escapement
Balance: Shock-proofed Glucydur balance with eccentric poising weights; superior-quality balance spring produced in-house, with patented attachment design (balance spring clamp), frequency 18,000 semi-oscillations per hour, precision beat adjustment with lateral setscrew and whiplash spring.
Power reserve: 36 hours when fully wound
Functions: Flyback chronograph with precisely jumping minute counter; perpetual calendar with outsize date, moon-phase display, day-of-week, month, four year/leap year, and day/night indication, hours, minutes, small seconds with stop seconds, tachometer scale.
Operating elements: Crown for winding the watch and setting the time, two push pieces for operating the chronograph, a universal corrector for simultaneously advancing all calendar displays plus one recessed push piece each for the day of the week, the month, and the moon phase.
Case: 41 millimetres in diameter, white gold
Crystal and caseback: Antireflection-coated sapphire crystal (hardness 9)
Dial: Solid silver, grey
Hands: Rhodiumed gold; chrono hand rhodiumed steel; seconds hand and minute counter blued steel
Strap: Crocodile strap with solid white gold Lange prong buckle
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