Swiss silver and rose gold open faced keyless lever watch Circa 1890

Silver and rose gold lever pocket watch by Vacheron & Constantin
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A very fine Swiss silver and rose gold open faced keyless lever pocket watch, circa 1890. Frosted gilt movement, wolf’s tooth winding, 17 jewels, straight-line moustache lever escapement, cut bimetallic compensation balance with temperature and meantime adjustment screws, blued steel flat balance spring, index regulator. Hinged silver cuvette engraved with the technical details and Eugene Cusin. White enamel dial with Arabic numerals, outer minute track, subsidiary seconds and original rose gold spade hands.  Polished case, rose gold hinges. Dial and cuvette signed, case and movement numbered.
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Diameter: 51 mm
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Signed: Vacheron & Constantin Genève