French gold jasper ruby and diamond pendant watch Circa 1840

Gold cylinder lady’s pendant watch
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A fabulous French 18 Carat gold, jasper, ruby and diamond-set pendant watch, circa 1840. A polished bezel, coin edge band, trefoil bow set with old cut rubies and diamonds, and the back cover set with a glossy jasper panel surrounded by old cut rubies and diamonds. Hinged gold cuvette. White enamel dial with radial Roman numerals, outer minute track. Black Breguet hands. A matte gilt movement, bar calibre, eight jewels, cylinder escapement, three arm balance, flat balance spring, and an index regulator. Cuvette signed.
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Diameter: 30.5  mm
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Signed: Rigaud & Fils  Paris