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.
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A. Lange & Söhne
Date, Power Reserve, Chronograph
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