Very rare Swiss gold double dialled cylinder watch Circa 1780

Gold, enamel and rose diamond set double dialled watch
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A very fine and very rare French gold, enamel and rose diamond set double dialled pocket watch with calendar, sun and moon dial, dial for diurnal and nocturnal hours and visible balance wheel, made for the French market, circa 1780. Gilt brass full plate movement, turned pillars, the back plate with engraved foliate border, spring barrel, cylinder escapement, three arm gold balance set with rose diamonds, blued steel flat balance spring.
Case, bezels decorated with foliate blue and white enamel on an engraved ground.
Pink enamel dial with four white subsidiary dials intersected by rose diamond set fleur-de-lys (some stones replaced), mean time dial with radial Roman numerals, minute track and Arabic five minute numerals, calendar dial, subsidiary seconds, regulation dial, the centre with aperture for the visible balance wheel. Gold hands. The back with rotating enamel sun and moon dial, outer white enamel annular chapter ring with radial Roman numerals for the diurnal and nocturnal hours. Stone set hand.
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Diameter: 43 mm
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Signed: No name
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The sun and moon disc and the hand for the diurnal/nocturnal dial are driven from a small pinion with 12 leaves meshing with another wheel mounted to the spring barrel arbour. This very beautiful watch although unsigned, shows the influence of Lepine in its execution. It would have been made for a wealthy and fashionable member of the French aristocracy.