Swiss gold pendant watch in the shape of a ball Circa 1800

Gold ball watch with detachable brooch
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A fine Swiss 18K gold, enamel and pearl-set ball-form pendant watch with a detachable gold, enamel and pearl-set brooch, circa 1800. A ball-form case, divided into segments alternately decorated with polished faceting and royal blue enamel with intertwined gold leaves and set with pearls, faceted pendant and bow. White enamel dial with Arabic numerals, outer minute divisions and gold hands. A frosted gilt full-plate movement, fusee and chain, verge escapement with micrometric potence adjustment, three-arm brass balance, flat balance spring, pierced and engraved continental type balance cock, silver regulation dial. Dial and movement signed.
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Diameter: 25 mm
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Signed: Louis Duchène  Genève
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Louis Duchène (1730-1804) specialised in fantasy watches with repeating and automata. From 1791 the company was called Louis Duchene & Fils.