Swiss gold split seconds chronograph with register Circa 1910

Gold open faced keyless lever
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A rare Swiss 18 carat gold split seconds chronograph keyless pocket watch made by Ed. Koehn in Geneva, circa 1900. Chronograph with visible work, the split seconds chronograph is activated by a push piece in the band, instantaneous 30 minute register. Swiss invention patent No. 34029, delivered on July 8, 1905, to Le Coultre & Cie. White enamel dial with Arabic numerals indicating the hours, an outer track for minutes and seconds marked with red Arabic numerals every five minutes, a subsidiary seconds dial, a 60 minute counter, a split seconds chronograph, and spade hands. Rhodium plated movement, 26 jewels, straight line lever escapement, cut bimetallic balance, Breguet balance spring. Dial, case and movement are signed.
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Diameter: 47 mm
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Signed: Ed. Koehn  Geneva
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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 a hanging barrel and pendant winding.