French gold and enamel ball watch and chain Circa 1810

Gold and enamel verge ball watch and chain
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A small French verge in an unusual gold and enamel vinaigrette ball watch with matching chain and key, circa 1810. Full plate gilt fusee movement. Finely pierced and engraved bridge cock with steel coqueret, plain three-arm gilt balance with blue steel spiral hairspring. Silver regulator dial with gilt indicator. Winding through the signed white enamel dial, Arabic numerals, and gold hands. Small spherical gold case opened by pressing a button in the long gold pendant. The case covered in black enamel decorated with white champlevé enamel. Inside the lid a pierced gold cover forming a vinaigrette. Matching gold and enamel chain and tipsy ratchet key. In a small fitted presentation case of red morocco lined in cream velvet.
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Diameter: 25 mm
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Signed: Gide et Blondet Fils
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A vinaigrette in a small-form watch is unusual. The addition of a matching chain and key is a welcome bonus.