A. Lange Sohne Datograph Up/Down Rose Gold Ref # 405.031

This is where the conversation starts—and usually ends.

The A. Lange & Söhne Datograph Up/Down isn’t just a chronograph—it’s a reference point for how a chronograph should be built. Fully in-house, manually wound, column wheel, flyback architecture, with a level of finishing and structural depth that very few movements come close to matching.

The caliber L951.6 is the focal point. German silver plates, hand-engraved balance cock, black polished steel components, and a layered construction that reveals something new every time you turn it over. It’s not decorative—it’s architectural. Every bridge, lever, and spring is placed with intent, both functionally and visually.

On the dial side, everything is kept in check. The power reserve (“Up/Down”) integrates cleanly, the chronograph layout remains perfectly balanced, and legibility is never compromised. At 41mm in rose gold, the case frames the movement without competing with it.

~60 hours of power reserve, flyback functionality, and one of the most mechanically satisfying chronograph actions in the category.

This is not a watch you buy into—it’s one you arrive at after everything else.

Key Details

• Case Size: 41mm

• Material: 18k Rose Gold

• Dial: Silver with black subdials

• Functions: Flyback Chronograph, Power Reserve Indicator

• Movement: Caliber L951.6 (manual-wind, in-house)

• Power Reserve: ~60 hours

• Strap: Alligator leather

Our Take

Among modern chronographs, the Datograph still sets the bar. Not because of brand positioning—but because of how the movement is executed.

Set Contents

This immaculate 2022 example comes as a complete set including:

• Reference 405.031 verified by A. Lange & Söhne’s certification (papers).

• Full set includes the original inner and outer boxes, leather holder, and booklets. 

• The watch comes on its original OEM A. Lange & Söhne leather strap with pin and buckle.  Butterfly straps are also available for sourcing.  

For collectors who prioritize architecture, finishing, and mechanical integrity, this is the benchmark.