American yellow gold octagonal lever dress watch Circa 1920

Gold octagonal watch by Tiffany
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A very fine, thin American 18-carat yellow gold Art Deco keyless dress watch, circa 1920. A polished plain octagonal case. An enamel dial with black Roman numerals and with blued steel hands. Straight-line lever escapement. Dial, case signed, movement by Ed. Koehn Geneva.
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Diameter: 43 mm
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Thickness: 6 mm
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Signed: Tiffany & Co.  New York
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Tiffany & Co, colloquially known as Tiffany’s, was founded in 1837 by the jeweller Charles Lewis Tiffany and became famous in the early 20th century under the artistic direction of his son Louis Comfort Tiffany. It is an American luxury jewellery and speciality design house headquartered on Fifth Avenue in Manhattan, New York.