Rare French gold watch with early lever movement Circa 1810

Gold and enamel lever watch
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A French very early lever watch in a pearl set gold and enamel open faced case, circa 1810. Small full plate gilt fusee movement. Finely pierced and engraved bridge cock, plain three arm gilt balance with blue steel spiral hairspring. Silver regulator dial with blue steel indicator. Wound through the gold engine turned dial, with black Roman numerals, blue steel Breguet hands. Gold open faced case, pearls set bezels, the sprung front bezel opened by depressing a button in the pendant. Gold back of translucent dark blue enamel over an engine turned ground.
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Diameter: 35 mm
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Weight: 27.5 g
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Signed: No name
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Lever movement invented by British clockmaker Thomas Mudge in 1755.
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Reference 0010000