Swiss platinum, diamond set lever pocket watch Circa 1920

Open faced keyless lever by Koehn
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A fine Swiss platinum and diamond set open faced keyless lever pendant watch, circa 1920. Retailed by Black, Starr & Frost. Nickel finished lever movement, 18 jewels. Hinged platinum cuvette. Silvered matte dial with Roman numerals. Small case, pavé set diamond bezel, band and snap on case back, diamond set crown and trefoil swivel bow. Movement signed by watchmaker, dial, cuvette and movement signed by retailer, case and movement numbered.
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Diameter: 24 mm
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Signed: Koehn Genève