Swiss 18K gold, enamel and diamond-set pendant watch Circa 1850

Gold open faced cylinder watch 
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A fine Swiss, 18K gold, enamel and rose-cut diamond-set lady’s pendant watch, circa 1850. A polished bezel, coin-edge band, the back decorated with rose-cut diamond stars on a translucent royal blue guilloche enamel ground. Hinged gold cuvette. White enamel dial with radial Roman numerals, outer minute track. Gold Breguet hands.
A matte gilt movement, bar calibre, eight jewels, cylinder escapement, plain three arm gilt balance, blued steel flat balance spring, index regulator. Cuvette signed.
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Diameter: 31 mm
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Signed: Rossel & Fils – succrs de J.F. Bautte & Cie  Genève
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The case is slightly scratched and the dial is chipped.