French gold and rose-cut diamonds lady’s pocket watch Circa 1850

Gold open faced lever pocket watch
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A very fine and rare French, 18k gold and rose-cut diamond-set open faced watch, circa 1850. The case back is fully set with rose-cut diamonds centred by green and red diamonds representing roses and leaves. Bezel and bow set with diamonds. White enamel dial, Arabic numerals intersected by rose-cut diamond-set indexes set in malachite, outer minute track with five-minute diamond indexes. Gilt diamond-set Louis XV hands. A frosted movement, three-arm brass balance with blued steel flat balance spring, index regulator. Case signed. 
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Diameter: 35 mm
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Signed: Le Roy & Fils  Paris
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The dial is slightly scratched.