French miniature gold and enamel pendant watch Circa 1850

Small gold key-wind lady’s watch
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A very small French, miniature 18K gold and enamel lady’s key-wind pendant watch, circa 1850. A polished case, hinged reserve with floral outer decoration in pale blue and gold, inner pale pink border to a central flower display, coin-edge band, hinged gold cuvette. White enamel dial, radial Roman numerals, outer minutes and gold Breguet hands. A frosted gilt movement, bar calibre, eight jewels, cylinder escapement, three-arm frosted gilt balance with flat blued steel balance spring, index regulator.
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Diameter: 21 mm
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Signed: J.J. Delarue  Paris
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Some scratches on the case.