Swiss 18k gold clockwatch with 11 complications Circa 1900

Extremely rare gold complicated lever by Edward Koehn sucr. de H.R. Ekegren
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A very fine, extremely rare and large Swiss 18 carat gold open faced trip minute repeating two train grande and petite sonnerie striking keyless lever clockwatch with perpetual calendar, moon phases and lunar calendar, circa 1900. This watch comes with 11 complications: minute repeating, grande sonnerie and petite sonnerie, strike/silent twin barrel differential winding, perpetual calendar, date, days of the week, months, four year cycle, moon phase and age. Frosted gilt movement, 33 jewels, two trains with twin barrels and differential winding, counterpoised straight-line lever escapement, cut bimetallic compensation balance with gold temperature and platinum meantime adjustment screws, blued steel Breguet balance spring with overcoil, swan neck micrometer regulator, striking and repeating on gongs by means of a trip slide on the band, sonnerie/silence and petite sonnerie/grande sonnerie selection levers under the bezel. Gold hinged gold cuvette. White enamel dial with black Roman numerals, outer minute track, subsidiary dials for the months and four year cycle, the date, days of the week, seconds combined with lunar calendar (in red), aperture for the phases of the moon and original black pear hands. Plain case, correctors in the band. Movement signed.
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Diameter: 58 mm
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Signed: Ed. Koehn
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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 fly back 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.