====== Lange L951 ======

The **Lange L951** is a [[hand-wound]] [[manufacture movement]] with [[flyback]]-[[chronograph]] function by [[A. Lange & Söhne]].


===== L951.0 =====
{{wst>image_cr|Lange|L951.0}}

The **Lange L951.0** is based on the previously released caliber [[#L951.1]], where the date function was removed.

Used in the [[A. Lange & Söhne 1815 Chronograph Flyback|1815 Chronograph Flyback]] model.

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**Description:**
  * [[Manual winding]] movement
  * [[Flyback]] [[chronograph]], [[column-wheel]] mechanism
  * Shock-resistant [[Glucydur]] [[balance]]
  * [[Three-quarter plate]]
  * [[Swan's neck fine regulation]]
  * [[Plate]]s and [[bridge]]s in untreated [[nickel silver]]
  * [[Balance cock]] engraved by hand

**Functions:**
  * Hours, minutes
  * [[Small seconds]]
  * [[Flyback]] [[chronograph]]
  * Precisely [[jumping]] minute counter

**Data:**
  * Ø 30.6 mm, height ? mm
  * 34 [[jewels]], including 4 in screwed gold [[chaton]]s
  * 18,000 A/h
  * Number of components 320
  * Power reserve 36 h

**Production period:**
  * From approx. [[2000]]
</WRAP>



===== L951.1 =====
{{wst>image_cr|Lange|L951.1}}

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

The hand-wound calibre Lange L951 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 [[chaton]]s, reduce the mechanical friction in the movement to a minimum.

<WRAP ud ud_mov>
**Description:**
  * [[Manual winding]] [[manufacture movement]]
  * [[Incabloc]] [[shock protection]]
  * [[Escapement]] stone lever
  * [[Yoke winding system]]
  * [[Screwed balance]] with [[Nivarox hairspring|Nivarox-1 hairspring]] and curved up overcoil
  * [[Chaton|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 [[ligne]]s
  * D 30.6 mm, H 7.5 mm
  * 34 [[jewels]], 4 in screwed gold [[chatons]]
  * 18,000 A/h
  * Power reserve 36 hours 

**Production period:**
  * Since [[1999]]
</WRAP>


===== L951.5 =====
{{wst>image_cr|Lange|L951.5}}

Further development of the [[#L951.0]] caliber with [[column wheel]] mechanism and stepped snail for the precisely jumping minute counter.

Used in the [[A. Lange & Söhne 1815 Chronograph]] model.

<WRAP ud ud_mov>
**Description:**
  * [[Manual winding]] [[manufacture movement]]
  * [[Flyback]] [[chronograph]]
  * [[Column-wheel]] mechanism and stepped snail for the precisely [[jumping]] minute counter
  * [[Balance cock]] engraved by hand
  * Shock-resistant [[cam-poised balance]]
  * Precision beat-adjustment system with lateral setscrew and whiplash spring
  * [[Plate]]s and [[bridge]]s in untreated [[nickel silver]]

**Functions:**
  * Hours, minutes
  * [[Small seconds]] with [[hacking seconds]]
  * [[Flyback]] [[chronograph]]

**Data:**
  * Ø 30.6 mm, height 6.1 mm
  * 40 [[jewels]], including 4 in screwed gold [[chaton]]s
  * 18,000 A/h
  * Number of components 306
  * Power reserve 60 h

**Production period:**
  * From [[2010]]
</WRAP>


===== L951.6 =====
{{wst>image_cr|Lange|L951.6}}

Used in the [[A. Lange & Söhne Datograph Up/Down]].
The watch's larger case allowed the mainspring barrel to be enlarged, thus increasing the power reserve to 60 hours.

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**Functions:**
  * Hours, minutes, [[small seconds]] at 8 h
  * [[Flyback]] chronograph with central 60-seconds counter and precisely [[jumping]] 30-minutes counter at 4 h 
  * [[Big date]] at 12 h
  * [[hacking seconds]]
  * [[Power reserve indicator]] at 6 h

**Data:**
  * 46 [[jewels]], including 4 in screwed gold [[chaton]]s
  * 451 components
  * Power reserve 60 hours
</WRAP>



{{tag>Movements Chronograph_movements Manual_winding_movements A._Lange_&_Söhne_calibres Column_wheel_chronograph_movements Flyback_chronograph_movements}}