Swiss 18 carat gold open faced lever pocket watch Circa 1860

A Swiss 18 carat gold open faced key wind pocket watch made by Vacheron in Geneva, circa 1860. The nickel finish lever movement with a cut and compensated bimetallic balance. White enamel dial with Roman hour numerals, an outer minute track, subsidiary seconds at 6 o’clock and black hands. The hinged guilloché engraved case depicts a river and mountain scene on the reverse. Cuvette signed. Comes with a stamped purchase receipt from Christie’s dated April 5th, 1979.
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Diameter: 43 mm
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Signed: Vacheron