====== A. Lange & Söhne Datograph Perpetual ======

{{wst>image_cr|A. Lange & Söhne|Datograph Perpetual|A. Lange & Söhne Datograph Perpetual ([[platinum]])}}
{{wst>image_cr|A. Lange & Söhne|Datograph Perpetual RS|A. Lange & Söhne Datograph Perpetual (back)}}

{{wst>image_cr|Lange|L952.1}}
{{wst>image_cr|Lange|L952.1 ZB|Calibre L952.1 dial side}}

**Datograph Perpetual** is a wristwatch by [[A. Lange & Söhne]]. 

With this [[2006]] launched [[self-winding]] luxury [[chronograph]] [[A. Lange & Söhne]] combined for the first time in a [[wristwatch]] a [[chronograph]] and a [[perpetual calendar]], which are exactly the two "opposite" extremes of timekeeping: short-term and permanent.

With its [[flyback]] function the [[chronograph]] can instantly be set to zero with a single keystroke during the time of measurement, whereafter the new measurement starts immediately. The [[perpetual calendar]] shows day of week, month, [[leap year]], day/night indication, [[moon phase]] and [[big date]]. The latter must be switched forward by a day only in [[2100]], making it become the "Eternal [[big date]]". The [[moon phase]] indication is so precise that it must be corrected for one day only after 122 years.

Till [[2010]] the Datograph Perpetual was offered solely in [[platinum]] with a hand-sewn crocodile leather strap or a bracelet quality available from [[platinum]].

[[2010]] a version with a [[rose gold]] case was launched. This version already bears the features of the modified dial design of the [[white gold]] version launched in 2015, see below.

In 2015, a revised version of the watch with [[white gold]] case appeared, see:
  * [[A. Lange & Söhne Datograph Perpetual (2015)]]

<WRAP ud ud_mod>
**Reference:**
  * 410.025 [[platinum]]
  * 410.425 platinum bracelet
  * 410.032 rose gold (2010)

**Movement:**
  * [[Manual winding]] Calibre [[Lange L952|L952.1]], 18,000 A/h
  * [[Column wheel]] controlled [[chronograph]] with [[flyback]] and exactly jumping minutes counter,
  * [[Perpetual calendar]] with [[moon phase]] indication and [[big date]]
  * 45 [[jewels]], four screwed gold [[chaton]]s
  * [[Glucydur]] [[balance wheel]] with [[regulation eccentrics]] and Lange [[hairspring]]
  * [[Plate]]s and [[bridge]]s in untreated [[German silver]], [[perlaged]], decorated with [[Glashütte Stripes]] 
  * All edges [[angled]] and polished
  * 556 components
  * Power reserve 36 hours

**Case:**
  * Ø 41 mm, height 13.5 mm
  * [[Sapphire crystal]], [[sapphire crystal]] caseback

**Dial:**
  * Solid [[silver]] with applied Roman numerals

**Functions:**
  * Hours, minutes, [[small seconds]]
  * 30 minute [[flyback]] [[chronograph]]
  * [[Perpetual calendar]] with day of week, month, [[leap year]]
  * Day/night indicator, [[moon phase]] and [[big date]]

**Bracelet:**
  * Crocodile leather strap
</WRAP>

{{tag>Watch_models Chronographs Watches_with_perpetual_calendar Watches_with_moon_phase A._Lange_&_Söhne_models A._Lange_&_Söhne_Datograph_models}}