====== A. Lange & Söhne Datograph Up/Down ======

{{wst>image_cr|A. Lange & Söhne|Datograph Up Down|Datograph Up/Down (platinum), Ref. 405.035}}
{{wst>image_cr|A. Lange & Söhne|Datograph Up Down (2024)|Datograph Up/Down (white gold, 2024)}}
{{wst>image_cr|Lange|L951.6}}

The **Datograph Up/Down** (German: **Datograph Auf/Ab**) is a wristwatch by [[A. Lange & Söhne]].

[[2012]] variant of the well-known [[flyback chronograph]] [[A. Lange & Söhne Datograph|Datograph]] with additional [[power reserve indicator]] (called "up/down" at Lange). 

The case diameter was increased to 41 mm, so that with the new caliber and an enlarged mainspring [[barrel]], the power reserve of the original model could be increased by 24 hours to a remarkable 60 hours.

Rhodinated gold [[baton]] hour markers on the dial – they also replace the former Roman numerals II, VI, and X – emphasize its clear design and identify the watch as a member of the [[Saxonia]] family that was just revised the year before.

In April [[2024]], Lange presented a version of the Datograph Up/Down with a [[white gold]] case at [[Watches & Wonders]] to mark the 25th anniversary of the Datograph.

<WRAP ud ud_mod>
**Reference:**
  * 405.035 [[platinum]]
  * 405.028 [[white gold]]

**Movement:**
  * [[Hand-winding]] movement [[Lange L951#L951.6|L951.6]], 18,000 A/h
  * [[Chronograph]] with classical [[column-wheel]] mechanism, with [[flyback]] function
  * [[Big date]], [[small seconds]]
  * 46 [[jewels]]
  * 4 screwed gold [[chaton]]s
  * [[Swan's neck fine regulation]]
  * [[Plate]]s and [[bridge]]s in untreated [[nickel silver]]
  * [[Balance cock]] engraved by hand
  * 451 components
  * Power reserve 60 hours

**Case:**
  * [[Platinum]]
  * Ø 41 mm, height 13.1 mm
  * Above [[sapphire crystal]]
  * Caseback sixfold screwed with [[sapphire crystal]] sighting window

**Dial:**
  * Solid [[silver]], black, applied baton markers
  * Lancet hands in [[Gold]], [[rhodinated]]
  * Hour and minute hands coated with [[superluminova]]
  * Small hands in [[blued]] steel 

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

**Bracelet:**
  * Blue-grey crocodile leather, hand-sewn, with [[tang-type buckle]] in [[platinum]]
</WRAP>

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