French gold enamel ruby and pearl set pendant watch Circa 1770

Pendant watch with a chatelaine hardstone set keys and seals
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A fine and rare 20 Carat gold enamel ruby and pearl set pendant watch with a gilded brass chatelaine with hardstone set keys and seals. Made by L’Epine in Paris, France circa 1770. Two-body Louis XV case with chased bezel and border with a repeated beaded pattern, the back decorated with a band of translucent green guilloché enamel, central ruby and pearl set rosette with beaded border, outer leaf border set with rubies and pearls and a chatelaine decorated with pastoral trophies and pierced foliage.
White enamel dial with radial Arabic numerals, outer minute track and Arabic five-minute numerals and pierced gold hands. Frosted gilt and full plate movement with conical pillars, fusee with chain, verge escapement with three-arm brass balance and flat balance spring, micrometric potence adjustment, continental pierced foliate balance cock with steel endplate and a silver regulator dial. Dial and movement signed.
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Diameter: 42 mm
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Signed: L’Epine