Exceptional Swiss gold keyless lever dress watch Circa 1923

Gold open faced keyless lever by Vacheron & Constantin
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Exceptional Swiss 18 carat gold open faced keyless lever dress watch, circa 1923. Bas, matte gilt movement, fully chased and engraved with ostrich feathers, 18 jewels, gold wheel train, wolf’s tooth winding, straight-line lever escapement, cut-bimetallic compensation balance, blued steel Breguet balance spring with overcoil, index regulator. Matte silver dial with champlevé dauphine numerals, outer champlevé minute track, subsidiary seconds and original gold Breguet hands. Polished case. Dial and case signed, case and movement numbered.
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Diameter: 46 mm
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Signed: Vacheron & Constantin Genève
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This watch is exceptionally rare and the movement is finished to a very high standard.