Thin Swiss 18K gold open faced oval lever pocket watch Circa 1975

Gold keyless lever watch 
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A very fine and thin Swiss 18 carat gold open faced oval keyless lever pocket watch, circa 1970s. Rhodium-plated movement, 17 jewels, Geneva Striping decoration, straight-line lever escapement, monometallic balance adjusted to heat, cold, isochronism and five positions, shock-absorber, self-compensating flat balance spring. Hinged gold cuvette. White enamel dial with applied gold baton indexes, subsidiary seconds at 6 o’clock and gold baton hands. A solid, polished case. Dial and movement signed, case signed and numbered.
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Diameter: 48
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Signed: Vacheron & Constantin Genève Swiss