Fine gold enamel and diamond-set French pocket watch Circa 1750

Gold enamel and diamond-set French pocket watch
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A fine 20 carat gold, enamel and diamond-set pocket watch. Made by Royal Blue Ageron à Paris Circa 1750.
Two-body case Louis XV, with the case maker’s initials JS, the back decorated with translucent royal blue guilloche enamel, central engraved motif highlighted in green enamel with white enamel `pearls`, outer white enamel `pearl` border and the further border with royal blue champlevé enamel stylized leaves, the bezel decorated to match and diamond-set thumb pieces.
White enamel dial with radial Roman numerals, outer minute divisions with large five-minute Arabic numerals and winding aperture at 2 o’clock. Diamond-set hands.
Hinged movement with frosted gilt full-plate with cylindrical pillars, fusee and chain, verge escapement with micrometric potence adjustment, brass balance with flat balance spring, continental cock and a silvered regulation dial.
Movement signed.
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Diameter: 41 mm
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Signed: Royal Blue Ageron à Paris