In 2010 A. Lange & Söhne launched the Zeitwerk ‘Luminous’, the first of what would become the ‘Lumen’ series, followed by the Grand Lange 1 ‘Lumen’ in 2013, and the Grand Lange 1 Moon Phase ‘Lumen’ in 2016, all of which were in platinum, and in limited editions.
They are now joined by the newest member of the Lumen family – the Datograph Up/ Down Lumen, again coming in a platinum case, and in a limited edition of two hundred pieces.
In 1999, A. Lange & Söhne introduced what would become perhaps one of (if not ‘the’) the brand’s defining models, the Datograph, a flyback column wheel chronograph with a jumping minute counter, which advances by one marker exactly when the chronograph function’s sweep-seconds hand passes the 60th second. In 2012, the Datograph Up/ Down was launched, with 60 hours of power reserve and the indicator at 6 o’clock.
This new Datograph Up/ Down Lumen now has all its indications legible even in darkness, thanks to a semi-transparent dial and luminous displays, which makes the chronograph function easy to use in the dark.
This is achieved through the use of the now familiar semi-transparent dial, with a luminous compound that gives the displays the same distinctive green ‘Lumen’ glow, in the dark. The rhodiumed gold hour and minute hands are filled with the luminous material, whereas the rhodiumed steel chronograph sweep seconds hand is fully coated with the compound. The seconds hand and minute counter in blued steel revolve above night-illuminated subsidiary dials. The outer ring is in polished German silver, and the inner ring is coated in sapphire crystal. The tachymeter scale is also luminous, as is the out-sized date and the power reserve indicator.
The two discs responsible for the over-sized date are lumed, the disc with its black printed numerals made of transparent glass rotating in front of a luminous background, charged during daylight hours through the semi-transparent dial. There is a coating on the dial crystal that filters out all light but for the part need to recharge the luminous pigments.
Through the open case back can be seen one of Lange’s glories – the manual wind in-house Calibre L951.7 beating at 18,000VPH, hand decorated, with plates and bridges made of German silver, and the classic hand-engraved balance cock by which all Lange owners know their watch.
The 41mm sized (13.4mm thick) platinum case comes on a black hand-stitched alligator leather strap with a platinum buckle.