English 22k gold pair cased enamel painted watch Circa 1775

Decorative gold watch, painted enamel en grisaille décor
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A decorative English 22 carat yellow gold and enamel pair cased keywound verge, enamel by William Story, circa 1775, round shaped pocket watch with dust cover.
White enamel dial. Royal blue and green enamelled outer case with an oval medallion painting enamel en grisaille in the centre showing an allegory of maternal love attributable to the workshop of George Michael Moser (1706-1783), London.
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Diameter: 43 mm
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Signed: William Story
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William Story, London, watchmaker registered in Red Lion Street. He died in 1784. A musical clock by him is kept in the British Museum. We also know a gilded metal and enamel coach watch with centre seconds, made for the Chinese market (see: Antiquorum, Hong Kong, auction, June 2, 2007, lot 104, sold for the amount of HK$ 165 200.-).