Model
Case:
Case Material
Pink gold
Case Glass
Sapphire
Case Back
Open
Case Diameter
41.00 mm
Case Height
13.10 mm
Case Lug Width
20.00 mm
Dial:
Dial Color
Black
Dial Indexes
Stick / Dot
Dial Hands
Alpha
Movement:
All 451 parts of the L951.6 manufacture calibre are lavishly finished. The sharply polished reentrant angle of many calibre components is an indication of the amount of work involved: this delicate, time-consuming process can only be executed by hand. The 8-gap column wheel coordinates all the switching operations of the chronograph mechanism. Rockers and levers of various shapes engage with this wheel. The considerable length of the levers is due to the special dial arrangement. They bypass the outsize-date mechanism and bridge the distance to the subsidiary dials located below the center line.
Type
Handwound
Brand
A. Lange & Söhne
Caliber
L951.6
Base
A. Lange & Söhne L951.0
Display
Analog
Diameter
30.60 mm
Jewels
46
Reserve
60 h
Frequency
18000 bph
Time
Hours, Minutes, Small Seconds
Date
Big Date
Chronograph
Chronograph, Flyback
Additionals
Power Reserve Indicator
Price: $ 288
The Datograph Up/Down ref. 405.031 was introduced in 2015, a few years after the initial launch of the Up/Down Datograph (in platinum). It features the new movement with (among other changes) the added 'up/down' power reserve indicator.

Ref. 405.031 features a pink gold case and a black dial with silver subdials.
  • A. Lange & Sohne Datograph Up/Down Pink Gold (405.031) Watch Replica