Swiss silver verge pocket watch with enamel painting Circa 1800

Silver open faced spindle watch by Du Bois
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A magnificent Swiss silver open faced spindle pocket watch with enamel en grisaille painting on the dial, circa 1800. Spindle mechanism.
Smooth case, signed and numbered, reeded band. Dial with extremely fine glazed en grisaille scene, eccentric small white enamel meantime dial at 6 o’clock,  the dial is professionally restored.
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Diameter: 54 mm
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Weight: 102 g
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Signed: Du Bois à Paris
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A grisaille (en grisaille), or grey painting, is a painting in which one does not apply natural colours but restricts oneself to depicting things in all possible shades of the same colour, usually grey or brown.