SIHH 2015: A. Lange & Söhne Datograph Perpetual White Gold / Beyaz Altın

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Datograph Perpetual WG Ref. 410.038

Movement
Lange manufacture calibre L952.1; 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 parts
556
Bearing jewels
45
Screwed gold chatons
4
Escapement
Lever escapement
Oscillator
Shock-resistant balance wheel with eccentric poising weights; balance spring manufactured in-house with a frequency of 18,000 semi-oscillations per hour, precision beat-adjustment system with lateral setscrew and whiplash spring
Power reserve
36 hours when fully wound
Functions
Time indicated in hours, minutes and subsidiary seconds with stop seconds; flyback chronograph with precisely jumping minute counter; tachymeter scale; perpetual calendar with date, day of week, month, moon phases and leap year; day/night indication
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 dimensions
Diameter: 41.0 millimetres; height: 13.5 millimetres
Movement dimensions
Diameter: 32.0 millimetres; height: 8.0 millimetres
Case
White gold
Dial
Solid silver, grey; subsidiary dials rhodié
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 blued steel
Crystal and back
Sapphire crystal (Mohs hardness 9)
Strap
Hand-stitched alligator leather strap, black
Buckle
Lange prong buckle in white gold

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