Swiss gold, coral and diamond-set watch with lapel brooch Circa 1840

Gold cylinder lady’s pendant watch
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A fine and rare Swiss, 18K gold, precious coral and rose-cut diamond-set lady’s pendant watch with a lapel brooch fitting en suite, circa 1840.The front cover set with graduated rings of alternating precious coral cabochons and rose-cut diamonds, reeded band, the back cover decorated with a star design set with rose-cut diamonds and a central cabochon coral. Hinged gold cuvette. White enamel dial, radial Roman numerals, outer minute track. Blued steel Breguet hands. A matte gilt movement, bar calibre, eight jewels, cylinder escapement, three-arm balance, blued steel flat balance spring, index regulator. Cuvette signed. 
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Diameter: 27 mm
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Signed: Robert Theurer & Fils  Chaux-de-Fonds
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Lacking elements.