A. Lange & Sôhne, Glashütte B/Dresden, No 40266, circa 1900. Extremely fine and rare 18 ct. pink gold minute repeating, moon phase astronomical keyless watch with perpetual calendar and single button double chronograph.\n\nFour body massive "Louis XV" polished case. Gold cuvette. Six piece white enamel dial with Arabic numerals, red Arabic outer minute and chronograph rings, subsidiary dials for the days of the week, the months of the leap year cycle, the date and the subsidiary seconds with inner moon phase aperture. Gold Louis XV hands. Very fine nickel plated 19"' three quarter plate movement with diamond spotted decoration, 32 jewels in gold screwed settings, gold straight line lever escapement, cut bimetallic balance, Breguet balance spring with a swan neck micrometric index. Repeating on gongs by means of a slide on the band. The split second chronograph with a visible work, the push piece on the band. Signed on the dial, the case, numbered on the movement. In excellent condition. Diam. 60 mm. The split second chronograph is operated by a single button, performing the functions: start/split/stop/reset. Illustrated and described in Martin Huber: Die Uhren von A. Lange & Sôhne, Glashütte/Sachsen pages 68-69.