Lange L951.1

File:Lange L951.1.jpg

Calibre Lange L951.1

The calibre Lange L951.1 by A. Lange & Söhne is used in the A. Lange & Söhne Datograph.

The hand-wound calibre L951.1 is an entirely newly developed chronograph movement in classical column wheel design and has a flyback function. With an adjustable shift lever, the exact point of the jumping point of the minutes counter can be set in the assembled movement - an invention for which Lange has received a patent. Also patented is the two-disc mechanism of the big date. The shock protected screw balance makes 18,000 vibrations per hour and is adjusted in five positions. The Swan's neck fine regulation with patented beat adjustment mechanism is mounted on the small balance cock. It is hand-engraved.

The three-quarter plate in untreated German silver is decorated with Glashütte Stripes, the edges in the movement are angled and polished.    40 jewels synthetic ruby, of which 4 are screwed in gold chatons, reduce the mechanical friction in the movement to a minimum.

Manufacturer: A. Lange & Söhne Description: Manual winding movement Incabloc shock protection Escapement: stone lever Yoke winding system Screwed balance with Nivarox-1 hairspring and curved up overcoil 4 screwed gold chatons Four-jewel bearing of the escape wheel Separate second wheel bridge and separate escape wheel bridge Adjustable chronograph coupling lever, positioned at the center of the second wheel Chronograph shift lever with solid shaft, mounted on both sides Minute counter rocker with jewel bearing on both sides Stepped snail for the precisely jumping minute counter 405 components Movement regulated in 5 positions Functions: Small seconds Big date Flyback function Data: 13½ lignes D 30.6 mm, H 7.5 mm 40 jewels 18,000 A/h Power reserve: 36 hours Production period: Since 1999