Swiss 18 Carat gold pocket watch with five complications Circa 1900

Gold open faced lever pocket watch
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A very fine and rare, large Swiss, 18 Carat yellow gold keyless pocket watch with perpetual calendar, moon phases and lunar calendar, circa 1900. Watch with five complications by Edward Koehn, Genève, Chronomètre 1ere Qualité. Hinged gold cuvette engraved with the technical details. White enamel dial with black Breguet numerals, outer minute track, subsidiary dials for the months and four year cycle, the date, day of the week, seconds combined with lunar calendar (in red) and aperture for the phases of the moon. Black Breguet hands. A 1st quality movement, rhodium plated, 21 jewels, wolf’s tooth winding, straight line moustache lever escapement, cut bi metallic compensation balance, blued steel Breguet balance spring with double overcoil, screw micrometer regulator.
Cuvette signed.
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Diameter: 52 mm
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Signed: Edward Koehn  Genève
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Edward Koehn (1839-1908) Was the son of Karl Koehn, a watchmaker to the court of the Grand Duchy of Saxe-Weimar-Eisenach. He came to Geneva in 1859 and studied at the Ecole d’Horlogerie. In 1861, he began working at Patek Philippe, as a mere employee. After 15 years of loyal service, he became Director. In 1891, Edward Koehn left Patek and bought the Robert Ekegren firm. Koehn constructed very high quality flat and extra flat watches, repeating watches, chronographs, and flyback chronographs. The firm, at the Grand Quai, made watches for Tiffany, New York and on June 8, 1912, patented a watch with hanging barrel and pendant winding, as well as the Roseau, under the No. 31470; and the Thermindex on February 13, 1922, under the No. 51304.–