====== A. Lange & Söhne Grand Complication ======

{{wst>image_cr|A. Lange & Söhne|Grand Complication|320px}}
{{wst>image_cr|Lange|L1902}}

The **Grand Complication** is a luxury wristwatch and also the most complicated watch from [[A. Lange & Söhne]].

Presented [[2013]], this model is inspired by the pocket watch Grande Complication No. 42500 from [[1902]]. It features a large and small chime, a [[minute repeater]], a [[perpetual calendar]] and a [[rattrapante chronograph]] function with [[flashing seconds]]. The assembly and fine-tuning of the mechanisms is so complex that only one watch is made per year and only six examples in total.

==== Repetition ====
The large and small chimes strike the time after a quarter of an hour has elapsed. The minute repeater is started by operating the slide at 8 o'clock. The striking mechanism has its own [[barrel]], which provides striking power for 24 hours. 

==== Perpetual calendar ====
The small golden hands of the calendar indications show the date, day of the week, month and leap year. 

==== Rattrapante Chronograph ====
The small blued hands and slim pair of center hands represent the rattrapante chronograph function. The power requirement of the flashing seconds is so high that it can only be met by its own barrel.

Based on the dial design, Lange counts the watch as part of the 1815 family.

<WRAP ud ud_mod>
**Reference:**
  * 912.032 [[red gold]]

**Movement:**
  * [[Manual winding]] [[manufacture movement]] [[Lange L1902|L1902]], 18,000 A/h
  * [[Rattrapante chronograph]], [[column-wheel]] control
  * [[Perpetual calendar]]
  * [[Repetition]]
  * [[Plate]]s and [[bridge]]s in untreated [[nickel silver]]
  * NIVAROX-1 [[flat hairspring]] from in-house production
  * [[Glucydur]] [[screw balance]]
  * Three [[barrel]]s (time, chime, chronograph)
  * Diameter: 40.5 mm, height: 14.2 mm
  * 67 [[jewels]], including 7 in screwed gold [[chatons]]
  * 876 components
  * Power reserve 30 hours

**Case:**
  * 18ct [[red gold]] 
  * Ø 50 mm, height 20.3 mm
  * [[Sapphire crystal]]
  * Caseback with [[sapphire crystal]] sighting window

**Dial:**
  * Copper, white, [[enameled]]; 5-part
  * Lancet hands in gold, gilded steel and [[blued]] steel

**Functions:**
  * Hours, minutes, [[small seconds]] with [[hacking seconds]]
  * [[Chronograph]] seconds, 30-minutes counter, [[rattrapante]] hands
  * [[Seconde foudroyante]]
  * [[Perpetual calendar]] with date, day of week, month, leap year, [[moon phase indication]]
  * Repetition with [[repetition#schlagfolgen|Petite and Grand Sonnerie]]

**Bracelet:**
  * Crocodile leather strap

**Limited edition:**
  * 6 pieces (1 per year)
</WRAP>

==== Video ====
  * [[https://www.youtube.com/watch?v=ZoDxIGZgWek|A. Lange & Söhne "Grand Complication"]], Youtube

{{tag>Watch_models Chronographs Rattrapante Watches_with_perpetual_calendar Watches_with_moon_phase Watches_with_repetition Grand_complication_watches A._Lange_&_Söhne_models A._Lange_&_Söhne_1815_models}}