Indian gold, enamel and diamond-set oval pendant watch Circa 1820

Gold open faced cylinder pendant watch
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A fine and rare, oval, gold, enamel and diamond-set pendant watch, circa 1820.
A hinged, oval case, textured case with blue enamel foliate decoration to the front and reverse, diamond-set bezel flanked by larger diamond highlights, locket location to the inner reserve, hinged gold cuvette. White enamel dial with black Roman numerals Arabic and outer blue Arabic numerals. Blued steel spade hands. Frosted gilt movement, bar style, later conversion to keyless winding, cylinder escapement, three-arm brass balance, blued steel flat balance spring, index regulator. Cuvette signed. 
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Dimensions: 40 x 33 mm
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Signed: Cooke & Kelvey  Calcutta
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The case is chipped.