French 18K gold verge pocket watch with calendar Circa 1800

Open faced double sided pocket watch 
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A very fine double sided verge pocket watch with calendar, circa 1800.
18k gold case, engraved and chased band, cord string decor, the back side with translucent coffee coloured enamelled bezel over engine turned ground, large lateral hinge. Dial front side: enamel, eccentric white dial with radial Roman hours, polychrome enamel surrounding, depicting flower tendrils and Cupids against a light green background, regulator scale, gold Louis XVI hands. Back side is enamel, outer ring with indication of the weekday, inner ring with indication of the date, blued hand. Full plate movement, keywind, firegilt, signed, chain/fusee, solid movement pillars, three arm brass balance.
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Diameter: 39 mm
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Weight: 47 g
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Signed: Ferriere à Paris