Fine Swiss 18 carat gold complicated lever watch Circa 1920

Gold astronomical watch by Edward Koehn
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A fine, first quality Swiss 18 carat gold open faced pocket watch with perpetual calendar, moon phases and lunar calendar, circa 1920. The rhodium plated movement with a straight line moustache lever escapement, 21 jewels, wolf’s tooth winding, a cut bimetallic compensation balance, blued steel Breguet balance spring with double overcoil and screw micrometer regulator. White enamel dial with Breguet hour numerals, an outer minute track, subsidiary dials for the months and four year cycle at 12 o’clock, days of the week at 9, the date at 3, an aperture for the moon phases with concentric auxiliary seconds combined with a lunar calendar in red at 6 and original Breguet hands. A plain case. Dial and movement signed, case signed and numbered. Comes with the fitted presentation box.
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Diameter: 52 mm
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Signed: Ed. 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 left Patek Philippe and bought the Robert Ekegren firm. He made very high quality flat and extra flat watches, repeating watches, chronographs and flyback chronographs. The firm, at the Grand Quai, delivered watches to Tiffany in New York, U.S.A. On June 8th, 1912, Koehn patented a watch with hanging barrel and pendant winding, as well as the Roseau under No. 31470 and the Thermindex on February 13th, 1922, under No. 51304.–