Datograph Perpetual in White Gold with Grey Dial
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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