French gold, enamel and pearl set pendant watch Circa 1820

Small open faced pendant watch
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A small French gold, enamel and open faced pendant watch studded with half pearls, circa 1820.
The case back is decorated with wavy and floral engine turned pattern and translucent green enamelling, both sides set with half pearls.
Enamelled gold case with case maker’s punch mark “FM”.
A full plate chain/fusee verge movement with a three arm brass balance.
White enamel dial with Arabic numerals, minute division and gold hands. Movement signed and numbered.
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Diameter: 31 mm
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Weight: 22 g
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Signed: Gérard Paris