The latest addition to A. Lange & Söhne’s “Lumen” series might very well be the greatest. It goes by the name of Datograph Up/Down Lumen, and comes powered by mechanics as complex as time itself. However, what ultimately distinguishes the watch are its semi-transparent dial with thoroughly legible markers. Thanks to a luminous compound, every indication takes on a majestic green hue, which glows stronger in darker environments. That’s all joined by a host of complications and apertures, resulting in an aesthetic stunner of considerable fortitude.
Meanwhile, the Datograph Up/Down Lumen is as impressive on the underside as it is on the top. Revealed through the sapphire-crystal caseback is an indescribably beautiful 454-part manually wound calibre L951.7. Equipped with a cam-poised balance wheel and oscillating hairspring, the hand-crafted movement hosts a 60-hour power reserve, and beats at a frequency of 18,000 semi-oscillations per hour. Ultimately, it can deliver time measurements with a resolution of 1/5 of a second.
Also featured on the Datograph Up/Down Lumen is a chronograph complication with flyback function, precisely jumping minute counter, and power-reserve indicator. Affixed to the 41mm platinum case is a black alligator leather strap with a platinum prong buckle. Limited to 200 units, this watch shines, indeed.