Fine French gold and enamel ball form pocket watch Circa 1790

Ball form pocket watch 
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A rare and very fine French 18 carat gold and enamel keywind form pocket watch, circa 1790. Gilt full plate fusée verge, pierced and engraved balance bridge, silver regulation.
White enamel dial, black Arabic numerals, black outer minute divisions with Arabic numeral 15-minute markers, winding aperture at 2, gilt Breguet style hands. Ball form case with blue enamel and gilt foliate decoration throughout, the front inscribed ‘Amitié’.
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Diameter: 27 mm
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Signed: No name