The Datograph Up/Down 405.031 presents A. Lange & Söhne's landmark chronograph in Rose Gold with a Black dial, one of the two regular-production versions of the model alongside Platinum. Introduced in this metal at SIHH 2015, it continues a lineage that began in 1999, when the Datograph became the reborn manufacture's first chronograph and quickly established itself as one of the most respected chronographs of its time. The Datograph combined a flyback function, a minute counter that jumps exactly on the minute and Lange's outsize date, and it was admired as much for the architecture of its hand-wound movement as for the balance of its dial. The Up/Down version of 2012 enlarged the case, extended the running time and added an indicator showing the state of wind, giving the watch the name it carries today. In Rose Gold, the Datograph Up/Down pairs the warmth of the metal with the depth of a black dial, a combination that emphasises the contrast of the silver subdials and gold hands and gives the watch a rich, classical presence on the wrist.
The Rose Gold case measures 41 mm across and 13.1 mm in height, finished with a polished bezel and caseback and a brushed case band, and flanked by two rectangular chronograph pushers. Beneath the crystal, a solid silver dial with a black finish follows the celebrated Datograph design. The outsize date sits at 12 o'clock in its framed double window. Two silver subdials sit on the horizontal axis: running seconds on the left at 9 o'clock and the jumping 30-minute counter on the right at 3 o'clock. At 6 o'clock, the power-reserve indicator marked AUF and AB completes the symmetry, its scale running through 60 hours. Rose Gold hands and applied Rose Gold baton markers glow against the black, while a tachymeter scale runs around the edge of the dial. The combination of black, silver and warm gold creates strong contrast and excellent legibility without any unnecessary decoration. An alligator strap with a Rose Gold buckle completes the watch, keeping its overall appearance classical and restrained despite the technical nature of the complication. In low light the silver subdials remain easy to pick out against the black, and the gold hands catch whatever light is available, so the chronograph can be read without hesitation.
The movement is hand-wound and consists of 451 parts. Its chronograph mechanism is controlled by a column wheel and uses a horizontal coupling, and the watch runs for 60 hours when fully wound. The upper pusher starts and stops the chronograph; the lower pusher resets it, and if pressed while the chronograph is running, triggers the flyback, which zeroes the hands and sets them running again in one movement, which is ideal for timing consecutive events. The minute counter jumps exactly at the end of each minute, avoiding the ambiguity of a creeping hand. The Up/Down indicator relies on a differential that compares the winding of the mainspring with its release, showing clearly when the watch needs attention. Through the sapphire caseback, the movement reveals the three-dimensional layout of levers and bridges for which the Datograph is renowned, finished with Glashütte techniques that include bridges of German silver, a hand-engraved balance cock with a whiplash spring, blued screws and screwed gold chatons. Lange assembles each movement twice, first for adjustment and then, after cleaning and decoration, for the final time.
The Datograph was the first chronograph produced by A. Lange & Söhne after its revival, and its debut in 1999 marked a turning point for the manufacture's reputation. Its original 39 mm version was produced in Platinum and later in Rose Gold, and it remained in the collection for well over a decade. In 2012 the Datograph Up/Down replaced it, with a redesigned movement offering longer running time, a balance spring made by Lange and the added state-of-wind indicator, all within a 41 mm case. The Platinum version came first, and the Rose Gold version with its black dial followed in 2015. The model has since become the foundation of an entire chronograph family, including the Datograph Perpetual and the Datograph Perpetual Tourbillon, and in 2024 its twenty-fifth anniversary was marked with a limited White Gold edition with a blue dial. Within that history, the Rose Gold 405.031 stands as one of the classic, enduring expressions of the Datograph, the version that combines Lange's traditional warmth with the model's contemporary technical character.
The 405.031 appeals to collectors who want one of the most admired chronographs of the modern era in a warm, classic form. Its Rose Gold case and Black dial give it a presence that works equally with business dress and evening wear, while its outsize date and power-reserve indicator make it a practical everyday watch. The flyback chronograph and jumping minute counter offer genuine functionality for those who time events, and the movement visible through the caseback provides endless interest for those who appreciate mechanics. At 41 mm, it has a confident but balanced presence on the wrist. It will interest collectors who admire the Datograph's movement architecture, and those who want a chronograph with a strong identity and a long history. For a collection centred on Lange's achievements, it is essential; for collectors of chronographs generally, it remains one of the defining references of modern high watchmaking.
